期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 122, 期 11, 页码 5870-5882出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JD026282
关键词
orographic rainfall; precipitation radar; TRMM; in situ measurements; Andes; Amazon
资金
- project Study of the physical processes that control the superficial flows of energy and water for the model of frost, intense rains, and evapotranspiration in the central Andes of Peru [PIBA-2-P-216-14]
The Andes-Amazon transition, along the eastern Peruvian Andes, features hot spots with strong precipitation. Using 15years of Tropical Rainfall Measuring Mission PR data we established a robust relation between terrain elevation and mean surface precipitation, with the latter peaking around 1000m above sea level (asl), coinciding with the moisture flux peak of the South American Low Level Jet (SALLJ). There is strong diurnal variability, with afternoon (13-18 LT) convection in the Amazon plains, while on the eastern slopes (1000-2000m asl), after the forcing associated with the thermal heating of the Andes subsides, convection grows during the night and surface precipitation peaks around 01-06 LT and organizes into mesoscale convective systems (MCSs). These then displace downslope to an terrain elevation of 700m asl with stratiform regions spreading upslope and downslope and then decay during the remainder of the morning. The large MCSs contribute with at least 50% of daily rainfall (60% of the 01-06 LT rainfall). On synoptic scales, the large MCSs are more common in stronger SALLJ conditions, although subtropical cold surges are responsible for 16% of the cases.
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