The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms
The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cl...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Yang, Xinyan [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2017 |
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| Rechteinformationen: |
Nutzungsrecht: © 2016 Royal Meteorological Society |
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| Schlagwörter: |
urban heat island degree hours urban cool island degree hours |
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| Systematik: |
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| Übergeordnetes Werk: |
Enthalten in: International journal of climatology - Chichester [u.a.] : Wiley, 1989, 37(2017), 2, Seite 890-904 |
|---|---|
| Übergeordnetes Werk: |
volume:37 ; year:2017 ; number:2 ; pages:890-904 |
| Links: |
|---|
| DOI / URN: |
10.1002/joc.4747 |
|---|
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OLC1990876250 |
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| 520 | |a The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. | ||
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10.1002/joc.4747 doi PQ20170301 (DE-627)OLC1990876250 (DE-599)GBVOLC1990876250 (PRQ)p1197-74f40c85d1e0c7f84ae4f43ed671c91c30037fd41875d5605247b0a1a690c0453 (KEY)0104704320170000037000200890urbancoolislandphenomenoninahighrisehighdensitycit DE-627 ger DE-627 rakwb eng 550 DNB RA 1000 AVZ rvk Yang, Xinyan verfasserin aut The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. Nutzungsrecht: © 2016 Royal Meteorological Society urban heat island degree hours urban cool island degree hours lumped urban air temperature model urban morphology Heat Roofing Morphology Li, Yuguo oth Luo, Zhiwen oth Chan, Pak Wai oth Enthalten in International journal of climatology Chichester [u.a.] : Wiley, 1989 37(2017), 2, Seite 890-904 (DE-627)130763128 (DE-600)1000947-4 (DE-576)023035773 0899-8418 nnns volume:37 year:2017 number:2 pages:890-904 http://dx.doi.org/10.1002/joc.4747 Volltext http://onlinelibrary.wiley.com/doi/10.1002/joc.4747/abstract http://search.proquest.com/docview/1863880053 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_4311 RA 1000 AR 37 2017 2 890-904 |
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10.1002/joc.4747 doi PQ20170301 (DE-627)OLC1990876250 (DE-599)GBVOLC1990876250 (PRQ)p1197-74f40c85d1e0c7f84ae4f43ed671c91c30037fd41875d5605247b0a1a690c0453 (KEY)0104704320170000037000200890urbancoolislandphenomenoninahighrisehighdensitycit DE-627 ger DE-627 rakwb eng 550 DNB RA 1000 AVZ rvk Yang, Xinyan verfasserin aut The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. Nutzungsrecht: © 2016 Royal Meteorological Society urban heat island degree hours urban cool island degree hours lumped urban air temperature model urban morphology Heat Roofing Morphology Li, Yuguo oth Luo, Zhiwen oth Chan, Pak Wai oth Enthalten in International journal of climatology Chichester [u.a.] : Wiley, 1989 37(2017), 2, Seite 890-904 (DE-627)130763128 (DE-600)1000947-4 (DE-576)023035773 0899-8418 nnns volume:37 year:2017 number:2 pages:890-904 http://dx.doi.org/10.1002/joc.4747 Volltext http://onlinelibrary.wiley.com/doi/10.1002/joc.4747/abstract http://search.proquest.com/docview/1863880053 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_4311 RA 1000 AR 37 2017 2 890-904 |
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10.1002/joc.4747 doi PQ20170301 (DE-627)OLC1990876250 (DE-599)GBVOLC1990876250 (PRQ)p1197-74f40c85d1e0c7f84ae4f43ed671c91c30037fd41875d5605247b0a1a690c0453 (KEY)0104704320170000037000200890urbancoolislandphenomenoninahighrisehighdensitycit DE-627 ger DE-627 rakwb eng 550 DNB RA 1000 AVZ rvk Yang, Xinyan verfasserin aut The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. Nutzungsrecht: © 2016 Royal Meteorological Society urban heat island degree hours urban cool island degree hours lumped urban air temperature model urban morphology Heat Roofing Morphology Li, Yuguo oth Luo, Zhiwen oth Chan, Pak Wai oth Enthalten in International journal of climatology Chichester [u.a.] : Wiley, 1989 37(2017), 2, Seite 890-904 (DE-627)130763128 (DE-600)1000947-4 (DE-576)023035773 0899-8418 nnns volume:37 year:2017 number:2 pages:890-904 http://dx.doi.org/10.1002/joc.4747 Volltext http://onlinelibrary.wiley.com/doi/10.1002/joc.4747/abstract http://search.proquest.com/docview/1863880053 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_4311 RA 1000 AR 37 2017 2 890-904 |
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10.1002/joc.4747 doi PQ20170301 (DE-627)OLC1990876250 (DE-599)GBVOLC1990876250 (PRQ)p1197-74f40c85d1e0c7f84ae4f43ed671c91c30037fd41875d5605247b0a1a690c0453 (KEY)0104704320170000037000200890urbancoolislandphenomenoninahighrisehighdensitycit DE-627 ger DE-627 rakwb eng 550 DNB RA 1000 AVZ rvk Yang, Xinyan verfasserin aut The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. Nutzungsrecht: © 2016 Royal Meteorological Society urban heat island degree hours urban cool island degree hours lumped urban air temperature model urban morphology Heat Roofing Morphology Li, Yuguo oth Luo, Zhiwen oth Chan, Pak Wai oth Enthalten in International journal of climatology Chichester [u.a.] : Wiley, 1989 37(2017), 2, Seite 890-904 (DE-627)130763128 (DE-600)1000947-4 (DE-576)023035773 0899-8418 nnns volume:37 year:2017 number:2 pages:890-904 http://dx.doi.org/10.1002/joc.4747 Volltext http://onlinelibrary.wiley.com/doi/10.1002/joc.4747/abstract http://search.proquest.com/docview/1863880053 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_4311 RA 1000 AR 37 2017 2 890-904 |
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10.1002/joc.4747 doi PQ20170301 (DE-627)OLC1990876250 (DE-599)GBVOLC1990876250 (PRQ)p1197-74f40c85d1e0c7f84ae4f43ed671c91c30037fd41875d5605247b0a1a690c0453 (KEY)0104704320170000037000200890urbancoolislandphenomenoninahighrisehighdensitycit DE-627 ger DE-627 rakwb eng 550 DNB RA 1000 AVZ rvk Yang, Xinyan verfasserin aut The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms 2017 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. Nutzungsrecht: © 2016 Royal Meteorological Society urban heat island degree hours urban cool island degree hours lumped urban air temperature model urban morphology Heat Roofing Morphology Li, Yuguo oth Luo, Zhiwen oth Chan, Pak Wai oth Enthalten in International journal of climatology Chichester [u.a.] : Wiley, 1989 37(2017), 2, Seite 890-904 (DE-627)130763128 (DE-600)1000947-4 (DE-576)023035773 0899-8418 nnns volume:37 year:2017 number:2 pages:890-904 http://dx.doi.org/10.1002/joc.4747 Volltext http://onlinelibrary.wiley.com/doi/10.1002/joc.4747/abstract http://search.proquest.com/docview/1863880053 GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_22 GBV_ILN_4311 RA 1000 AR 37 2017 2 890-904 |
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Enthalten in International journal of climatology 37(2017), 2, Seite 890-904 volume:37 year:2017 number:2 pages:890-904 |
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urban cool island phenomenon in a high‐rise high‐density city and its mechanisms |
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The urban cool island phenomenon in a high‐rise high‐density city and its mechanisms |
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The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. |
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The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. |
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The urban heat island ( UHI ) phenomenon has been studied extensively, but there are relatively fewer reports on the so‐called urban cool island ( UCI ) phenomenon. We reveal here that the UCI phenomenon exists in Hong Kong during the day and is associated with the UHI at night under all wind and cloud conditions. The possible mechanisms for the UCI phenomenon in such a high‐rise compact city have been discovered using a lumped urban air temperature model. A new concept of urban cool island degree hours ( UCIdh ) to measure the UCI intensity and duration is proposed. Our analyses reveal that when anthropogenic heat is small or absent, a high‐rise, and high‐density city experiences a significant daytime UCI effect. This is explained by an intensified heat storage capacity and the reduced solar radiation gain of urban surfaces. However, if anthropogenic heat in the urban area increases further, the UCI phenomenon still exists; yet, UCIdh decrease dramatically in a high‐rise compact city. In a low‐rise, low‐density city, the UCI phenomenon also occurs when there is no anthropogenic heat, but easily disappears when there is little anthropogenic heat, and the UHI phenomenon dominates. This probably explains why the UHI phenomenon is often observed, but the UCI phenomenon is rarely observed. The co‐existence of urban heat/cool island phenomena implies reduction of the daily temperature range in such cities, and its dependence on urban morphology also implies that urban morphology can be used to control the urban thermal environment. |
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