Impact assessment of changes in agricultural and natural vegetation mosaics on near-surface meteorological fields in the Yangtze River Delta

doi:10.3969/2018jms.0013

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長(zhǎng)三角地區(qū)農(nóng)業(yè)與自然植被鑲嵌體的變化對(duì)近地面氣象場(chǎng)的影響評(píng)估
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                        10.3969/2018jms.0013
                    
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基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目（41641046）

Impact assessment of changes in agricultural and natural vegetation mosaics on near-surface meteorological fields in the Yangtze River Delta

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摘要:

利用一個(gè)中尺度數(shù)值模式WRF3.8/Noah/UCM，對(duì)長(zhǎng)三角地區(qū)近30 a來(lái)灌溉水田顯著減少，農(nóng)業(yè)與自然植被鑲嵌體（以下簡(jiǎn)稱(chēng)鑲嵌體）顯著增加這一現(xiàn)象引起的氣候效應(yīng)進(jìn)行了5 a （2008-2012年）高分辨數(shù)值模擬。試驗(yàn)采用了ChinaLC土地覆蓋資料，利用MODIS反照率和葉面積指數(shù)產(chǎn)品分別驗(yàn)證了ChinaLC在鑲嵌體和水田之間的分類(lèi)可靠性。根據(jù)研究區(qū)內(nèi)臺(tái)站觀測(cè)資料評(píng)估了ChinaLC和WRF模式自帶的USGS資料模擬結(jié)果，進(jìn)一步證明土地覆蓋資料ChinaLC的分類(lèi)準(zhǔn)確性，有助于提高模式的模擬性能。通過(guò)對(duì)長(zhǎng)三角地區(qū)鑲嵌體面積變化的對(duì)比試驗(yàn)進(jìn)行分析，結(jié)果表明：區(qū)域內(nèi)由灌溉水田轉(zhuǎn)變?yōu)殍偳扼w后，不僅會(huì)使非城市區(qū)氣象條件改變，同時(shí)也會(huì)影響臨近的城市區(qū)，由于非城市區(qū)增溫幅度大于城市區(qū)，會(huì)導(dǎo)致城郊溫差減弱；鑲嵌體增加導(dǎo)致江蘇西南部、浙江北部氣溫上升0.1~0.3℃，風(fēng)速減弱0.1~0.3 m·s^-1，比濕降低0.05~0.15 g·kg^-1，邊界層高度上升40 m。在鑲嵌體顯著增加的南京北部-滁州以及江蘇西南部一帶降水減少，南京北部-滁州地區(qū)月平均降水減少了0.6 mm·d^-1，馬鞍山-溧水降水減少了0.2 mm·d^-1。

Abstract:

This study uses a mesoscale numerical model WRF3.8/Noah/UCM, to conduct a 5-year (2008—2012) high resolution numerical simulation for the climate effect caused by the phenomenon of obvious decrease of irrigated paddy fields and obvious increase of agricultural and natural vegetation mosaics (hereinafter referred to as mosaics) in the Yangtze River Delta region in the past 30 years. First, ChinaLC land cover data was written into the WRF model. The classification reliability of ChinaLC between mosaics and paddy fields was verified by MODIS albedo and leaf area index products respectively. According to the station observation data, the built-in USGS data simulation results of ChinaLC and WRF models were evaluated. After analysis, the ChinaLC has been proved to have good classification accuracy and to be conducive to improving the simulation performance of the model. The results of an analysis of the contrast experiment of the Yangtze River Delta region show: because the mosaics areas took place of the paddy fields, not only the weather condition of non-urban areas changed, but also that of the urban areas was affected, and since the growth rate in non-urban areas was larger than that in urban areas, the temperature difference between urban and non-urban areas weakened. Due to the increase of mosaics, temperature increased 0.1—0.3 ℃ in the southwest of Jiangsu and north of Zhejiang Province, the wind speed decreased by 0.1—0.3 m·s^-1, the specific humidity decreased by 0.05—0.15 g·kg^-1 and the planetary boundary layer height increased by 40 m. The precipitation decreased in Northern Nanjing-Chuzhou and southwestern Jiangsu Province, where the mosaic significantly increased. The average monthly precipitation in Northern Nanjing-Chuzhou decreased by 0.6 mm·d^-1, and that in Ma'anshan—Lishui decreased by 0.2 mm·d^-1.

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梁永曉,馬紅云,江志紅,保云濤,李海俊.長(zhǎng)三角地區(qū)農(nóng)業(yè)與自然植被鑲嵌體的變化對(duì)近地面氣象場(chǎng)的影響評(píng)估.氣象科學(xué),2019,39(1):23-33 LIANG Yongxiao, MA Hongyun, JIANG Zhihong, BAO Yuntao, LI Haijun. Impact assessment of changes in agricultural and natural vegetation mosaics on near-surface meteorological fields in the Yangtze River Delta. Journal of the Meteorological Sciences,2019,39(1):23-33

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收稿日期:2017-09-25
最后修改日期:2017-12-05
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在線發(fā)布日期: 2019-03-18
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说