کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4736690 1640849 2014 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
El Niño phases embedded in Asian and North American drought reconstructions
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
El Niño phases embedded in Asian and North American drought reconstructions
چکیده انگلیسی


• Primary drought patterns are identified over Asia and NA for the past 700 years.
• Tree-rings over Asia and NA respond differently to the phases of El Niño.
• Thus proxy records may encode long-term behavior of ENSO at different phases.

The amplitude of El Niño-Southern Oscillation (ENSO) varies substantially at each phase of its evolution, affecting the timing and patterns of atmospheric teleconnections around the globe. Instrumental records are too short to capture the full behavior of ENSO variability. Here we use the well-validated Monsoon Asia Drought Atlas (MADA) and North America Drought Atlas (NADA) for the past 700 years, and show that tree-ring records from different regions represent tropical sea surface temperature (SST) conditions at various phases of ENSO. Three modes of tree-ring based summer drought variability are found to be correlated with ENSO: summer droughts over the Maritime Continent and Southwest North America (NA), and a dipole mode between Central and South Asia. A lagged correlation analysis is performed to determine the time when precipitation and temperature anomaly imprints on summer droughts as recorded in tree-rings. Drought anomalies in the Maritime Continent and Southwest NA represent ENSO at the developing and peak phases respectively, while those over Central/South Asia are associated with tropical-wide SST anomalies (including the Indian Ocean) at the decay phase of ENSO. Thus proxy records from different regions can provide valuable information on long-term behavior of ENSO at different phases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 85, 1 February 2014, Pages 20–34
نویسندگان
, , ,