土壤濕度初始異常對(duì)東亞區(qū)域氣候模擬影響的敏感性試驗(yàn)

doi:10.3969/2014jms.0020

首頁 > 過刊瀏覽>2015年第35卷第4期 >379-388. DOI:10.3969/2014jms.0020

土壤濕度初始異常對(duì)東亞區(qū)域氣候模擬影響的敏感性試驗(yàn)
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                        10.3969/2014jms.0020
                    
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基金項(xiàng)目:國家自然科學(xué)基金資助項(xiàng)目(41230422);公益性行業(yè)(氣象)科研專項(xiàng)(GYHY201206017);江蘇省自然科學(xué)基金-杰出青年基金項(xiàng)目(BK20130047);新世紀(jì)優(yōu)秀人才支持計(jì)劃

Sensitivity experiments of impacts of initial soil moisture anomalies on East Asian regional climate simulation

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利用耦合了CLM3.5陸面模式的區(qū)域氣候模式RegCM4.0,通過敏感性試驗(yàn),探討了人為減小春季初始土壤體積水含量對(duì)短期時(shí)間尺度東亞夏季氣候模擬的可能影響。結(jié)果表明:較低的初始土壤濕度場能夠明顯改變區(qū)域的地表能量平衡,引起地表凈長波輻射和感熱通量的顯著增加,進(jìn)而加強(qiáng)了地表對(duì)大氣的加熱,因而引起東亞大范圍地區(qū)特別是中國東部、印度北部和中亞地區(qū)地表溫度、氣溫的升高。與氣溫不同,初始土壤濕度場對(duì)降水的影響很小而且有較大的不確定性,同時(shí)偏暖的下墊面使得對(duì)流層中高層出現(xiàn)暖高壓異常,但這些影響均不顯著。綜合來看,土壤濕度初始場的初始異常,對(duì)RegCM4.0 模式東亞氣候模擬的結(jié)果有一定影響,特別是在地表溫度、氣溫和能量平衡方面,應(yīng)在以后的模擬中加以考慮。

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The regional climate model RegCM4.0 coupling with a land surface model CLM3.5 was used to investigate the possible impacts of initial soil moisture anomalies on East Asian summer climate by idealized sensitivity experiments in short-term scale. Results suggest that large-scale initial soil moisture anomalies can alter the surface energy balance and cause evident increase of net surface long-wave radiation and sensible heat flux, as well as intensify surface thermal heating to the atmosphere. Meanwhile, low initial soil moisture anomalies can lead to a significant warming effect in both surface and air temperature over East China, North India and Central Asian. Unlike temperature, the impact of initial soil moisture anomalies on precipitation is insignificant and has large uncertainties, even if warmer underlying surface causes abnormalities of warm high pressure in middle and upper tropospheres, but these effects were not obvious. Overall, the initial soil moisture anomalies have a certain impact on the climate simulation results of RegCM4.0 in East Asia, especially on the temperature and energy flux, which should be considered in simulation in the future.

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史一叢,陳海山,高楚杰.土壤濕度初始異常對(duì)東亞區(qū)域氣候模擬影響的敏感性試驗(yàn).氣象科學(xué),2015,35(4):379-388 SHI Yicong, CHEN Haishan, GAO Chujie. Sensitivity experiments of impacts of initial soil moisture anomalies on East Asian regional climate simulation. Journal of the Meteorological Sciences,2015,35(4):379-388

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收稿日期:2014-01-11
最后修改日期:2014-03-10
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在線發(fā)布日期: 2015-09-11
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