Disentangling sea-surface temperature and anthropogenic aerosol influences on recent trends in South Asian monsoon rainfall

2018 ◽  
Vol 52 (3-4) ◽  
pp. 2287-2302 ◽  
Author(s):  
Nitin Patil ◽  
Chandra Venkataraman ◽  
Kaushik Muduchuru ◽  
Subimal Ghosh ◽  
Arpita Mondal
Atmósfera ◽  
2013 ◽  
Vol 26 (4) ◽  
pp. 537-546 ◽  
Author(s):  
S.E. Lluch-Cota ◽  
M. Tripp-Valdez ◽  
D.B. Lluch-Cota ◽  
J.J. Bautista-Romero ◽  
D. Lluch-Belda ◽  
...  

2020 ◽  
Vol 157 (6) ◽  
pp. 864-878 ◽  
Author(s):  
Huayu Lu ◽  
Ruixuan Liu ◽  
Linhai Cheng ◽  
Han Feng ◽  
Hanzhi Zhang ◽  
...  

AbstractWe investigate the phased evolution and variation of the South Asian monsoon and resulting weathering intensity and physical erosion in the Himalaya–Karakoram Mountains since late Pliocene time (c. 3.4 Ma) using a comprehensive approach. Neodymium and strontium isotopic compositions and single-grain zircon U–Pb age spectra reveal the sources of the deposits in the east Arabian Sea, and show a combination of sources from the Himalaya and the Karakoram–Kohistan–Ladakh Mountains, with sediments from the Indian Peninsula such as the Deccan Traps or Craton. We interpret shifts in the sediment sources to have been forced by sea-level changes that correlate with South Asian monsoon rainfall variation since late Pliocene time. We collected 908 samples from the International Ocean Discovery Program Hole U1456A, which was drilled in the east Arabian Sea. Time series of hematite content and grain size of the sediments were examined downcore. We found South Asian monsoon precipitation and weathering intensity experienced three phases from late Pliocene time. Lower monsoon precipitation, with a lower variability and strong weathering intensity, occurred during 3.4–2.4 Ma; an increased and more variable South Asian monsoon rainfall, along with strengthened but fluctuating weathering intensity, occurred at 1.8–1.1 Ma; and a reduced rainfall with lower South Asian monsoon precipitation variability and moderate weathering intensity marked the period 1.1–0.1 Ma. Maximum entropy spectral analysis and wavelet transform show that there were orbital-dominated cycles of periods c. 100 and c. 41 ka in these proxy-based time series. We propose that the monsoon, sea level, global temperature and insolation together forced the weathering and erosion in SW Asia.


2006 ◽  
Vol 53 (3) ◽  
pp. 188-197 ◽  
Author(s):  
Ahmed Salahuddin ◽  
Ronald H. Isaac ◽  
Scott Curtis ◽  
Jun Matsumoto

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