長(zhǎng)三角城市群非均勻性對(duì)區(qū)域熱島效應(yīng)影響的數(shù)值模擬

doi:10.3969/2018jms.0053

首頁 > 過刊瀏覽>2019年第39卷第2期 >194-205. DOI:10.3969/2018jms.0053

長(zhǎng)三角城市群非均勻性對(duì)區(qū)域熱島效應(yīng)影響的數(shù)值模擬
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                        10.3969/2018jms.0053
                    
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中圖分類號(hào):X16
基金項(xiàng)目:國(guó)家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2017YF0603804）；國(guó)家自然科學(xué)基金資助項(xiàng)目（41641046）

Numerical simulation of the impact of inhomogeneity of urban agglomeration in the Yangtze River Delta on regional heat island effect

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摘要:

使用中尺度數(shù)值模式WRF3.9/Noah/UCM，對(duì)長(zhǎng)三角地區(qū)無明顯天氣過程的2013年8月11至17日一周進(jìn)行數(shù)值模擬，采用2013年500 m分辨率的MODIS數(shù)據(jù)更新土地覆蓋資料，依據(jù)城鎮(zhèn)比例將城市下墊面進(jìn)一步分類為高中低3種類型，以此研究長(zhǎng)三角城市群非均勻性對(duì)區(qū)域熱島效應(yīng)的影響。結(jié)果表明：長(zhǎng)三角城市群近地面氣象要素場(chǎng)對(duì)城市下墊面的非均勻性比較敏感，平均熱島強(qiáng)度、干島強(qiáng)度和風(fēng)速衰減相較于不考慮城市非均勻性分別減小了16.41%、20.04%和6.25%；受背景風(fēng)場(chǎng)影響，白天城市群的熱島強(qiáng)度弱于夜晚，均有向下游擴(kuò)展現(xiàn)象，且內(nèi)陸城市的熱島強(qiáng)度和干島強(qiáng)度較沿岸區(qū)域更強(qiáng)；相比于均勻城市下墊面試驗(yàn)，考慮非均勻城市影響后，整體熱島強(qiáng)度和干島強(qiáng)度減弱；白天垂直熱島環(huán)流結(jié)構(gòu)明顯，整體可以伸展至2 km高度，在東南風(fēng)背景下，熱島上游高密度城市的熱島環(huán)流會(huì)抑制下游熱島環(huán)流發(fā)展，考慮城市非均勻性后，上游效應(yīng)更顯著；熱島強(qiáng)度受非均勻性影響在傍晚和夜間最高減弱可達(dá)0.2℃，且進(jìn)入較強(qiáng)熱島的時(shí)間會(huì)推遲，維持時(shí)間也將縮短。因此，忽略城市下墊面的非均勻性，可能會(huì)高估區(qū)域熱島效應(yīng)。

Abstract:

Using the mesoscale numerical model WRF3.9/Noah/UCM, a numerical simulation was carried out for the week from August 11, 2013 to August 17, 2013 when there was no obvious weather process in the Yangtze River Delta region, and land cover was updated with 2013 MODIS data of 500m resolution. According to the proportion of urban areas, the urban underlying surface is further classified into high, medium and low types to study the impact of their inhomogeneity on the regional heat island effect. The results show that the near-surface meteorological element field in the Yangtze River Delta is sensitive to the inhomogeneity of underlying urban areas. The average heat island intensity, dry island intensity and wind speed attenuation reduce by 16.41%, 20.04% and 6.25%, respectively, compared with those without considering the urban inhomogeneity. Affected by the background wind field, the heat island intensity of urban agglomerations in daytime is weaker than that at night, but both of them extend downstream, and the heat island intensity and the dry island intensity in inland cities is stronger than that in coastal areas. Compared with the test on heterogeneous city underlying surface, and considering the effect of inhomogeneity on the urban environment, the heat island intensity and dry island identity weaken on a whole. The structure of the vertical heat island circulation during daytime is obvious, and the overall structure can extend to a height of 2 km. With the southeast wind, the heat island circulation in the high density urban areas of the upper reaches on the heat island will restrain the development of the downstream heat island circulation. Considering the urban inhomogeneity, the upstream effect is more significant. The heat island intensity is affected by the inhomogeneity in the evening and at night, and can be weakened up to 0.2℃. Besides, the time to become a stronger heat island will be delayed, and the holding time will also be shortened. Therefore, neglecting the inhomogeneity of urban underlying surface may overestimate the regional heat island effect.

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李海俊,馬紅云,林益同,梁永曉.長(zhǎng)三角城市群非均勻性對(duì)區(qū)域熱島效應(yīng)影響的數(shù)值模擬.氣象科學(xué),2019,39(2):194-205 LI Haijun, MA Hongyun, LIN Yitong, LIANG Yongxiao. Numerical simulation of the impact of inhomogeneity of urban agglomeration in the Yangtze River Delta on regional heat island effect. Journal of the Meteorological Sciences,2019,39(2):194-205

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收稿日期:2018-03-09
最后修改日期:2018-05-20
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在線發(fā)布日期: 2019-06-01
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