scholarly journals Modeling El Niño and its tropical teleconnections during the last glacial-interglacial cycle

2003 ◽  
Vol 30 (23) ◽  
pp. n/a-n/a ◽  
Author(s):  
Bette L. Otto-Bliesner ◽  
Esther C. Brady ◽  
Sang-Ik Shin ◽  
Zhengyu Liu ◽  
Christine Shields
Keyword(s):  
El Niño ◽  
El Nino ◽  
Last Glacial ◽  
Tropical Teleconnections ◽  
The Last Glacial

Millennial and orbital variations of El Niño/Southern Oscillation and high-latitude climate in the last glacial period

Nature ◽  
2004 ◽  
Vol 428 (6980) ◽  
pp. 306-310 ◽  
Author(s):  
Chris S. M. Turney ◽  
A. Peter Kershaw ◽  
Steven C. Clemens ◽  
Nick Branch ◽  
Patrick T. Moss ◽  
...  
Keyword(s):  
High Latitude ◽  
El Niño ◽  
El Nino ◽  
Southern Oscillation ◽  
El Niño Southern Oscillation ◽  
El Nino Southern Oscillation ◽  
Glacial Period ◽  
Last Glacial Period ◽  
Last Glacial ◽  
The Last Glacial

scholarly journals Paleoproductivity Variations in the Equatorial Arabian Sea: Implications for East African and Indian Summer Rainfalls and the El Niño Frequency

Radiocarbon ◽  
2006 ◽  
Vol 48 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Manish Tiwari ◽  
Rengaswamy Ramesh ◽  
Ravi Bhushan ◽  
B L K Somayajulu ◽  
A J Timothy Jull ◽  
...  
Keyword(s):  
El Niño ◽  
Arabian Sea ◽  
El Nino ◽  
Southern Oscillation ◽  
Southwest Monsoon ◽  
East African ◽  
Radiocarbon Dates ◽  
Last Glacial ◽  
Productivity Data ◽  
The Last Glacial

We analyzed a sediment core from the equatorial Arabian Sea, chronologically constrained by accurate accelerator mass spectrometry (AMS) radiocarbon dates on selected planktonic foraminiferal species, for paleoproductivity variations corresponding to the variations in the Indian Ocean Equatorial Westerlies (IEW). The IEW in turn are positively correlated to the Southern Oscillation Index (SOI), which is a measure of El Niño, Southwest monsoon (SWM), and east African rainfall (EAR). The productivity data show that Indian and east African rainfalls declined from 35,000 calendar yr BP up to the last glacial maximum (LGM), with the maximum El Niño frequency during the last glacial period. From ∼14,500 to ∼2000 calendar yr BP (i.e. core top), we find strengthening SWM and EAR along with declining El Niño frequency.

scholarly journals Asymmetric response of the Indian summer monsoon to positive and negative phases of major tropical climate patterns

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Arindam Chakraborty ◽  
Priyanshi Singhai
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
El Niño ◽  
El Nino ◽  
Tropical Climate ◽  
La Niña ◽  
Moisture Convergence ◽  
La Nina ◽  
Climate Patterns ◽  
Tropical Teleconnections

AbstractThe existing theories for the tropical teleconnections to Indian summer monsoon (ISM) are diverse in approaches. As a result, it is impossible to quantify the relative impacts of different tropical climate patterns on ISM, complying with a single physical mechanism. Here, we show that tropical teleconnections to ISM can be explained through net moisture convergence driven by surface pressure (Ps) gradients surrounding the Indian region. The positive and negative phases of major tropical climate patterns modulate these pressure gradients asymmetrically in the zonal and/or meridional directions leading to asymmetric changes in moisture convergence and ISM rainfall (ISMR). Stronger El Nino droughts than La Nina floods are due to greater decreased eastward moisture flux over the Arabian Sea during El Nino than the corresponding increase during La Nina driven by proportionate meridional Ps gradients. While the equatorial Atlantic Ocean’s sea surface temperature in boreal summer and El Nino Southern Oscillation in the preceding winter changes ISMR significantly, moisture convergence anomalies driven by the Indian Ocean Dipole were insignificant. Moreover, while ISMR extremes during ENSO are due to asymmetric changes in zonal and meridional gradients in Ps, non-ENSO ISMR extremes arise due to the zonal gradient in zonally symmetric Ps anomalies.

Reconstruction of past climate variability and ENSO-like fluctuations in the southern Gulf of California (Alfonso Basin) since the last glacial maximum

2015 ◽  
Vol 83 (3) ◽  
pp. 488-501 ◽  
Author(s):  
Francisca Staines-Urías ◽  
Oscar González-Yajimovich ◽  
Luc Beaufort
Keyword(s):  
El Niño ◽  
Gulf Of California ◽  
El Nino ◽  
Late Glacial ◽  
The North ◽  
Surface Productivity ◽  
The Last Glacial Maximum ◽  
The North Pacific ◽  
Average Position ◽  
The Last Glacial

Nannofossil assemblages from core MD02-2510 provide a ~ 22 ka record of past oceanographic variability in Alfonso Basin (Gulf of California, east subtropical Pacific). In this area, environmental conditions depend on a monsoonal system heavily influenced by changes in the location of the ITCZ and nearby atmospheric pressure centers. To reconstruct nutricline depth and ENSO-like variability, two ecological indexes were calculated based on the relative abundance of the three dominant coccolith species. The late glacial period is characterized by intensified wind-driven upwelling, high primary productivity and La Niña-like conditions. An environmental shift occurs during the glacial–interglacial transition, El Niño-like conditions intensify, nutricline deepens and surface productivity declines. The late Holocene is characterized by a persistent increase in nutricline depth and dominance of El Niño-like conditions. The fluctuations in the composition of the coccolith assemblages can be related to orbital-scale fluctuations in the average position of the ITCZ. However, while the ENSO-like signal that overprints the record varies in response to orbital forcing, on suborbital time scales the relation between ENSO-like conditions and the average position of the ITCZ and the North Pacific High changes, suggesting that the development of persistent El Niño-like conditions is strongly dependent on the specific climatic background.

Alopecia en el niño

2020 ◽  
Vol 55 (4) ◽  
pp. 1-14
Author(s):  
K. Legal ◽  
P. Plantin
Keyword(s):  
El Niño ◽  
El Nino

Alopecia en el niño

2020 ◽  
Vol 54 (3) ◽  
pp. 1-15
Author(s):  
K. Legal ◽  
P. Plantin
Keyword(s):  
El Niño ◽  
El Nino
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