High-Elevation Monsoon Precipitation Processes in the Central Andes of Peru

被引:12
作者
Chavez, S. P. [1 ,2 ]
Silva, Y. [2 ]
Barros, A. P. [1 ]
机构
[1] Duke Univ, Dept Civil & Environm Engn, Durham, NC 27706 USA
[2] Peruvian Geophys Inst, Ate, Peru
关键词
precipitation radar; orographic precipitation; Andes; ENSO; microphysics; Amazon; RAIN-PROFILING ALGORITHM; AMERICAN LOW-LEVEL; TROPICAL ANDES; OROGRAPHIC RAINFALL; DIURNAL CYCLE; RADAR; CLIMATOLOGY; VARIABILITY; JET; TEMPERATURE;
D O I
10.1029/2020JD032947
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Measurements at the high-elevation Lamar Observatory in the Mantaro Valley (MV) in the Central Andes of Peru demonstrate a diurnal cycle of precipitation characterized by convective rainfall during the afternoon and nighttime stratiform rainfall with embedded convection. Wet season data (2016-2018) reveal long-duration (6-12 hr) shallow precipitating systems (LDPS) that produced about 17% of monsoon rainfall in 2016 and 2018 associated with El Nino and La Nina, respectively. The LPDS fraction of monsoon rainfall doubles to 35% with weekly recurrence in 2017 under El Nino Costero (coastal) conditions. LDPS occur under favorable moisture conditions dictated by the South America (SA) Low-Level Jet (SALLJ) and Cold Air Intrusions (CAIs). Backward trajectory analysis shows that precipitable water sustains >80% of seasonal precipitation and ties the LPDS to particular moisture source regions in the eastern Andes foothills 1-2 days in advance, enhanced by increased moisture supply in the midtroposphere. Higher frequency of CAIs and enhanced midlevel moisture convergence along CAI fronts explain the increased LDPS frequency during the 2017 El Nino Costero. These findings highlight the functional role of the Andes morphology in organizing moisture supply to high-elevation precipitation systems on the orographic envelope. Analysis of the Global Precipitation Measurement (GPM) mission satellite-based radar observations points to challenges to precipitation detection and estimation in this region as the GPM clutter-free height (similar to 1-2 km AGL) exceeds the depth of shallow precipitation systems in the MV.
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页数:23
相关论文
共 83 条
[1]   Measurement uncertainty in rainfall kinetic energy and intensity relationships for soil erosion studies: An evaluation using PARSIVEL disdrometers in the Southern Appalachian Mountains [J].
Angulo-Martinez, M. ;
Barros, A. P. .
GEOMORPHOLOGY, 2015, 228 :28-40
[2]  
[Anonymous], 2002, J GEOPHYS RES JGR AT, DOI DOI 10.1029/2001JD001315
[3]   Improving quantitative precipitation estimates in mountainous regions by modelling low-level seeder-feeder interactions constrained by Global Precipitation Measurement Dual-frequency Precipitation Radar measurements [J].
Arulraj, Malarvizhi ;
Barros, Ana P. .
REMOTE SENSING OF ENVIRONMENT, 2019, 231
[4]   Shallow Precipitation Detection and Classification Using Multifrequency Radar Observations and Model Simulations [J].
Arulraj, Malarvizhi ;
Barros, Ana P. .
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY, 2017, 34 (09) :1963-1983
[5]   TRMM PR Standard Algorithm 2A23 and its Performance on Bright Band Detection [J].
Awaka, Jun ;
Iguchi, Toshio ;
Okamoto, Ken'ichi .
JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN, 2009, 87A :31-52
[6]  
Barrett A., 2013, Orographic Precipitation, Freshwater Resources, and Climate Vulnerabilities in Mountainous Regions, Climate Vulnerability: Understanding and Addressing Threats to Essential Resources, P57, DOI DOI 10.1016/B978-0-12-384703-4.00504-9
[7]  
Barros A., 2020, Satellite Precipitation Measurement, P559, DOI [DOI 10.1007/978-3-030-35798-6_6, 10.1007/978-3-030-24568-9, DOI 10.1007/978]
[8]   Probing orographic controls in the Himalayas during the monsoon using satellite imagery [J].
Barros, AP ;
Kim, G ;
Williams, E ;
Nesbitt, SW .
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES, 2004, 4 (01) :29-51
[9]   DYNAMIC MODELING OF OROGRAPHICALLY INDUCED PRECIPITATION [J].
BARROS, AP ;
LETTENMAIER, DP .
REVIEWS OF GEOPHYSICS, 1994, 32 (03) :265-284
[10]   Very high resolution rainfall patterns measured by TRMM precipitation radar: seasonal and diurnal cycles [J].
Biasutti, Michela ;
Yuter, Sandra E. ;
Burleyson, Casey D. ;
Sobel, Adam H. .
CLIMATE DYNAMICS, 2012, 39 (1-2) :239-258