Heat and Moisture Ratio in Agricultural Regions of Southern Russia in Summer under the Conditions of Climate Change

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-12-28 DOI:10.3103/s1068373923090066

T. B. Titkova, A. N. Zolotokrylin, M. A. Tarasova

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Abstract

It is revealed that there was a significant increase in the Bowen ratio in the Volga, Southern, and North Caucasian federal districts in the second half of the 20th century–beginning of the 21st century. This indicates a strengthening of sensible heat flux and a reduction of latent heat flux in the heat and moisture balance. These changes are caused by a significant temperature rise, especially in the south of European Russia, with a regional decrease in precipitation. The Bowen ratio is inversely proportional to precipitation and NDVI and directly proportional to temperature. In the steppe zone represented by the Volga, Southern, and North Caucasian federal districts the long periods of predominance of the Bowen ratio anomalies of a certain sign can be distinguished for June and July: the positive ones in the 1950s and until the mid-1960s, the negative ones after that until the early 2000s, and the positive ones since the middle of the first decade of the 21st century. Since the second decade of the 21st century, the positive anomalies of the Bowen ratio have become more frequent in some years and have exceeded the standard deviation. An increase in the contribution of heat to the heat and moisture exchange balance led to a degradation of vegetation conditions in the Volga, Southern, and North Caucasus federal districts. In the south of the Siberian Federal District, the fluctuation of the Bowen ratio anomalies is less pronounced than in European Russia, which suggests some stability of heat and moisture supply in summer over the past 70 years.

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气候变化条件下俄罗斯南部农业区夏季的热量和水分比

摘要研究表明，在 20 世纪下半叶至 21 世纪初，伏尔加、南部和北高加索联邦地区的鲍温比显著增加。这表明在热量和水分平衡中，显热通量增加，潜热通量减少。造成这些变化的原因是气温显著升高，尤其是在俄罗斯欧洲南部，同时区域降水量减少。Bowen 比率与降水和净植被指数成反比，与温度成正比。在以伏尔加、南高加索和北高加索联邦区为代表的草原区，6 月和 7 月的鲍温比值异常以某种符号为主的时期很长：20 世纪 50 年代至 60 年代中期为正值，此后至 21 世纪初为负值，21 世纪第一个十年中期以来为正值。自 21 世纪第二个十年以来，某些年份的鲍温比值正异常变得更加频繁，并超过了标准偏差。热量对热量和水分交换平衡的贡献增加，导致伏尔加、南部和北高加索联邦区的植被状况恶化。在西伯利亚联邦区南部，鲍温比值异常的波动不如俄罗斯欧洲地区明显，这表明在过去 70 年中，夏季热量和水分供应具有一定的稳定性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.