干旱气象 ›› 2022, Vol. 40 ›› Issue (3): 345-353.DOI: 10.11755/j.issn.1006-7639(2022)-03-0345

• 论文 • 上一篇    下一篇

亚洲东部和南部土壤干湿状态对陆气耦合的影响分析

邸燕君1(), 曾鼎文2(), 张文波1, 闫晓敏1, 安晓东3, 陈诚1, 韩雯婷4, 柳媛普2   

  1. 1.甘肃省气象服务中心,甘肃 兰州 730020
    2.中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点实验室,甘肃 兰州 730020
    3.甘肃麦克气象信息技术有限公司,甘肃 兰州 730020
    4.重庆市气象局,重庆 401147
  • 收稿日期:2021-08-21 修回日期:2021-11-12 出版日期:2022-06-30 发布日期:2022-06-28
  • 通讯作者: 曾鼎文
  • 作者简介:邸燕君(1988―)女,甘肃榆中人,硕士,工程师,主要从事陆气相互作用及新能源研究. E-mail: 1113187645@qq.com
  • 基金资助:
    气候过渡带辐射蒸散比的剧变特征及其与土壤湿度关系的研究(41875020);气候变化背景下局地和非局地陆气耦合对我国东北季节干旱的影响机制(42105035);陆气耦合对我国西北地区东部季节干旱的影响机理(21JR7RA699);甘肃省气象局“西北区域数值预报创新团队”(GSQXCXTD-2020-02);“新能源气象服务创新团队”(GSQXCXTD-2020-03)

Influence of dry/wet soil state on land-atmosphere coupling over eastern and southern Asia

DI Yanjun1(), ZENG Dingwen2(), ZHANG Wenbo1, YAN Xiaomin1, AN Xiaodong3, CHEN Cheng1, HAN Wenting4, LIU Yuanpu2   

  1. 1. Gansu Provincial Meteorological Service Center, Lanzhou 730020, China
    2. Institute of Arid Meteorology of CMA, Key Laboratory of Arid Climatic Change and Disaster Reducing of Gansu Province, Key Laboratory of Arid Climatic Change and Disaster Reducing of CMA, Lanzhou 730020, China
    3. Gansu Mike Meteorological Information Technology limited Company, Lanzhou 730020,China
    4. Chongqing Meteorological Service, Chongqing 401147, China
  • Received:2021-08-21 Revised:2021-11-12 Online:2022-06-30 Published:2022-06-28
  • Contact: ZENG Dingwen

摘要:

基于1979—2020年5—8月欧洲中期天气预报中心(European Centre for Medium-Range Weather Forecasts, ECMWF)第五代全球大气再分析产品——ERA5逐日数据计算了3个度量陆气耦合强度的指数,分析了亚洲东部和南部区域陆气耦合的气候态特征及其在不同土壤干湿条件下的差异。结果表明,从气候态看,华北-东北、青藏高原、印度、中国云南-东南亚和中纬度干旱带为较强陆气耦合区。在华北-东北、青藏高原、印度、中国云南-东南亚地区,土壤越干,陆气耦合强度越大,这种因土壤湿度不同而导致的耦合强度的显著差异,存在于从土壤湿度到蒸散发,再从蒸散发到边界层水汽和不稳定度的各耦合过程中,产生这种差异的主要原因是上述区域土壤湿度变率较大。而在中纬度干旱带,由于土壤湿度值及其变率均很小,耦合强度随土壤干湿条件变化无明显差异。华南为弱陆气耦合区,只有土壤偏干时,土壤湿度和蒸散发之间才能发生显著耦合,而蒸散发和边界层在所有土壤干湿条件下均不发生显著耦合。

关键词: 陆气耦合, 亚洲东部和南部, ERA5, 土壤干湿条件

Abstract:

Based on European Centre for Medium-Range Weather Forecasts (ECMWF) fifth-generation global atmospheric reanalysis (ERA5) every day from May to August during 1979-2020, three land-atmosphere indexes to investigate land-atmosphere coupling processes were calculated,characteristics of land-atmosphere coupling in climatology and their difference under different dry and wetsoil conditions were analyzed over eastern and southern Asia. The results show that Northeast and North China,the Tibetan plateau, India, Yunnan Province of China and Southeast Asia,the middle latitude arid zone were strong land-atmosphere coupling zones in climatology. In the middle latitude arid zone, land-atmosphere coupling had no significant difference under different soil conditions due to the low soil moisture and its little variability. In the other strong coupling zones, the coupling strength decreased with increasing soil moisture condition because of the bigger variability of soil moisture in these regions, and this law is applicable to the coupling processes between soil moisture(SM) and evapotranspiration (ET), between ET and water vapor condition of boundary layer, between ET and instability condition of boundary layer. The land-atmosphere couplings over South China were weak in climatology, coupling between SM and ET was significant only under dry soil conditions, while the coupling between ET and atmospheric boundary layer were not significant under all soil moisture conditions.

Key words: land-atmosphere coupling, eastern and southern Asia, ERA5, dry and wet soil conditions

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