環(huán)太湖地區(qū)土地利用變化的局地氣候效應(yīng)

doi:10.3969/2012jms.0163

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環(huán)太湖地區(qū)土地利用變化的局地氣候效應(yīng)
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                        10.3969/2012jms.0163
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金（40875028）；南京大學(xué)研究生創(chuàng)新基金（2010CL12）

Local climate response to land use change in Taihu lake area

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利用WRF模式和1985年、2005年環(huán)太湖區(qū)域的土地利用資料，模擬了環(huán)太湖區(qū)域土地利用變化的局地氣候效應(yīng)，并從陸面過(guò)程的角度進(jìn)行了分析。模擬結(jié)果顯示：城市擴(kuò)張區(qū)域凈短波輻射通量增多，地面溫度升高，感熱通量增大，潛熱通量減小。近地面水平風(fēng)場(chǎng)在城市化地區(qū)風(fēng)速減小，在城市化帶方向上形成狹長(zhǎng)的動(dòng)能衰減區(qū)域。湖陸風(fēng)和城市熱島環(huán)流增強(qiáng)，城市化地區(qū)向上垂直速度增大，積云性降水增多。老城區(qū)和郊區(qū)下沉運(yùn)動(dòng)增強(qiáng)，對(duì)流受到抑制，積云性降水減少。層云降水的改變，集中在層云降水的大值區(qū)，且多呈帶狀分布?？偨邓诔鞘谢瘏^(qū)域增強(qiáng)，在老城區(qū)和郊區(qū)減少，積云性降水占總降水的比值增大。在土地利用沒(méi)有變化的區(qū)域，降水的改變與地表能量通量的改變?cè)诳臻g分布上大致吻合。

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By using the WRF model and land use data in 1985 and 2005 in Taihu lake area two numerical simulations are conducted to study the local climate responses to land use change. An analysis from a point of view of land surface processes is also performed. The results show that net short wave radiation fluxes, ground surface temperatures, and sensitive heat fluxes increased in the urbanized areas, while latent heat fluxes decreased. A decline of wind speed was found in the urbanized areas, and in the direction of the urbanization the belts in which kinetic energy decreased were also found. Moreover, lake breeze and urban heat island circulations enhanced. Consequently, cumulus precipitation occurred in urbanized areas and increased due to the additional vertical velocity, while convection and cumulus precipitation in old town and suburbs were inhibited. Stratiform precipitation's change was limited in areas of concentrated stratiform rainfall. Total precipitation increased in urbanized area, but decreased in old town and suburbs, with the growing proportion of convective precipitation. In areas with no land use change, the pattern of precipitation change coincided quite well with the pattern of surface energy flux change.

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劉振,潘益農(nóng),張潤(rùn)森,濮勵(lì)杰.環(huán)太湖地區(qū)土地利用變化的局地氣候效應(yīng).氣象科學(xué),2013,33(6):619-626 LIU Zhen, PAN Yinong, ZHANG Runsen, PU Lijie. Local climate response to land use change in Taihu lake area. Journal of the Meteorological Sciences,2013,33(6):619-626

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收稿日期:2012-04-18
最后修改日期:2012-07-25
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在線發(fā)布日期: 2013-12-27
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