scholarly journals Summer Monsoon Season Streamflow Variations in the Middle Yellow River since 1570 CE Inferred from Tree Rings of Pinus tabulaeformis

Atmosphere ◽  
2020 ◽  
Vol 11 (7) ◽  
pp. 717 ◽  
Author(s):  
Feng Chen ◽  
Magdalena Opała-Owczarek ◽  
Piotr Owczarek ◽  
Youping Chen
Keyword(s):  
Tree Rings ◽  
Summer Monsoon ◽  
Yellow River ◽  
Asian Summer Monsoon ◽  
Monsoon Season ◽  
Pinus Tabulaeformis ◽  
The Yellow River ◽  
Summer Monsoon Season ◽  
Streamflow Reconstruction ◽  
Asian Summer

This study investigates the potential reconstruction of summer monsoon season streamflow variations in the middle reaches of the Yellow River from tree rings in the Qinling Mountains. The regional chronology is significantly positively correlated with the July–October streamflow of the middle Yellow River from 1919 to 1949, and the derived reconstruction explains 36.4% of the actual streamflow variance during this period. High streamflows occurred during 1644–1757, 1795–1806, 1818–1833, 1882–1900, 1909–1920 and 1933–1963. Low streamflows occurred during 1570–1643, 1758–1794, 1807–1817, 1834–1868, 1921–1932 and 1964–2012. High and low streamflow intervals also correspond well to the East Asian summer monsoon (EASM) intensity. Some negative correlations of our streamflow reconstruction with Indo-Pacific sea surface temperature (SST) also suggest the linkage of regional streamflow changes to the Asian summer monsoon circulation. Although climate change has some important effects on the variation in streamflow, anthropogenic activities are the primary factors mediating the flow cessation of the Yellow River, based on streamflow reconstruction.

Observed changes in extreme wet and dry spells during the South Asian summer monsoon season

2014 ◽  
Vol 4 (6) ◽  
pp. 456-461 ◽  
Author(s):  
Deepti Singh ◽  
Michael Tsiang ◽  
Bala Rajaratnam ◽  
Noah S. Diffenbaugh
Keyword(s):  
South Asian ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Monsoon Season ◽  
South Asian Summer Monsoon ◽  
Summer Monsoon Season ◽  
The South ◽  
Dry Spells ◽  
Asian Summer

scholarly journals Widespread air pollutants of the North China Plain during the Asian summer monsoon season: A case study

2018 ◽  
Author(s):  
Jiarui Wu ◽  
Naifang Bei ◽  
Xia Li ◽  
Junji Cao ◽  
Tian Feng ◽  
...  
Keyword(s):  
Air Quality ◽  
Summer Monsoon ◽  
North China Plain ◽  
North China ◽  
Asian Summer Monsoon ◽  
Monsoon Season ◽  
Northwest China ◽  
Summer Monsoon Season ◽  
The North ◽  
Asian Summer

Abstract. During the Asian summer monsoon season, prevailing southeasterly – southwesterly winds are subject to delivering air pollutants from the North China Plain (NCP) to the Northeast and Northwest China. In the present study, the WRF-CHEM model is used to evaluate contributions of trans-boundary transport of the NCP emissions to the air quality in the Northeast and Northwest China during a persistent air pollution episode from 22 to 28 May 2015. The WRF-CHEM model generally performs well in capturing the observed temporal variation and spatial distribution of fine particulate matters (PM2.5), ozone (O3), and NO2. The simulated temporal variation of aerosol species is also in good agreement with measurements in Beijing during the episode. Model simulations show that the NCP emissions contribute substantially to the PM2.5 level in Liaoning and Shanxi provinces, the adjacent downwind areas of the NCP, with an average of 24.2 and 13.9 μg m−3 during the episode, respectively. The PM2.5 contributions in Jilin and Shaanxi provinces are also appreciable, with an average of 9.6 and 6.5 μg m−3, respectively. The NCP emissions contribute remarkably to the O3 level in Liaoning province, with an average of 46.5 μg m−3, varying from 23.9 to 69.5 μg m−3. The O3 level in Shanxi province is also influenced considerably by the NCP emissions, with an average contribution of 35.1 μg m−3. The average O3 contributions of the NCP emissions to Jilin and Shaanxi provinces are 28.7 and 20.7 μg m−3, respectively. The effect of the NCP emissions on the air quality in Inner Mongolia is generally insignificant however. Therefore, effective mitigations of the NCP emissions not only improve the local air quality, but also are beneficial to the air quality in the Northeast and Northwest China during the Asian summer monsoon season.

scholarly journals Widespread air pollutants of the North China Plain during the Asian summer monsoon season: a case study

2018 ◽  
Vol 18 (12) ◽  
pp. 8491-8504 ◽  
Author(s):  
Jiarui Wu ◽  
Naifang Bei ◽  
Xia Li ◽  
Junji Cao ◽  
Tian Feng ◽  
...  
Keyword(s):  
Air Quality ◽  
Summer Monsoon ◽  
Asian Summer Monsoon ◽  
Monsoon Season ◽  
Northwest China ◽  
Shanxi Province ◽  
Summer Monsoon Season ◽  
Average Percentage ◽  
The North ◽  
Asian Summer

Abstract. During the Asian summer monsoon season, prevailing southeasterly–southwesterly winds are subject to delivering air pollutants from the North China Plain (NCP) to northeast and northwest China. In the present study, the WRF-CHEM model is used to evaluate contributions of trans-boundary transport of NCP emissions to the air quality in northeast and northwest China during a persistent air pollution episode from 22 to 28 May 2015. The WRF-CHEM model generally performs well in capturing the observed temporal variation and spatial distribution of fine particulate matter (PM2.5), ozone (O3), and NO2. The simulated temporal variation of aerosol species is also in good agreement with measurements in Beijing during the episode. Model simulations show that NCP emissions contribute substantially to the PM2.5 level in Liaoning and Shanxi provinces, the adjacent downwind areas of the NCP, with an average of 24.2 and 13.9 µg m−3 during the episode, respectively. The PM2.5 contributions in Jilin and Shaanxi provinces are also appreciable, with an average of 9.6 and 6.5 µg m−3, respectively. The average percentage contributions of NCP emissions to the PM2.5 level in Liaoning, Jilin, Shanxi, and Shaanxi provinces are 40.6, 27.5, 32.2, and 20.9 %, respectively. The NCP emissions contribute remarkably to the O3 level in Liaoning province, with an average of 46.5 µg m−3, varying from 23.9 to 69.5 µg m−3. The O3 level in Shanxi province is also influenced considerably by NCP emissions, with an average contribution of 35.1 µg m−3. The O3 level in Shanxi province is also influenced considerably by NCP emissions, with an average contribution of 35.1 µg m−3. The average O3 contributions of NCP emissions to Jilin and Shaanxi provinces are 28.7 and 20.7 µg m−3, respectively. The average percentage contributions of NCP emissions to the afternoon O3 level in Liaoning, Jilin, Shanxi, and Shaanxi provinces are 27.4, 19.5, 21.2, and 15.8 %, respectively. However, the effect of NCP emissions on the air quality in Inner Mongolia is generally insignificant. Therefore, effective mitigation of NCP emissions not only improves the local air quality, but is also beneficial to the air quality in northeast and northwest China during the Asian summer monsoon season.

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