ENSO effects on annual variations of summer precipitation stable isotopes in Lhasa, southern Tibetan Plateau

ENSO effects on annual variations of summer precipitation stable isotopes in Lhasa, southern... AbstractWhile El Niño-Southern Oscillation (ENSO) influences the Indian summer monsoon, its impact on moisture transport towards the southern Tibetan Plateau (TP) remains poorly understood. Precipitation stable isotopes are the useful indices on climate change in the TP. Classical interpretations of variations of precipitation stable isotopes focus on local surface air temperature or precipitation amount. However, several latest studies suggested they may correlate with large-scale modes of variability, such as ENSO. Here we present a detailed study of ENSO effect on annual variations of 𝛿18Op (oxygen stable isotopic composition of precipitation) at Lhasa in the southern TP for up to ten years. The stable isotopic composition of water vapor from satellite data (Tropospheric Emission Spectrometer (TES)) and simulations from isotopically enabled atmospheric general circulation model (zoomed LMDZiso) are used to explore the mechanism that leads to variations of 𝛿18Op at Lhasa. Statistically significant correlations between 𝛿18Op and ENSO indices (Southern Oscillation index (SOI) and Niño 3.4 Sea Surface Temperature Index (Nino3.4)) are observed. We show that ENSO impacts on the location and intensity of convection over the Arabian Sea, Bay of Bengal and tropical Indian Ocean, along moisture transport paths towards Lhasa; further impacts on convection from the northern Tibetan Plateau. The changing of these convections results in lower 𝛿18Op at Lhasa in 2007 La Niña year and higher 𝛿18Op in 2006 El Niño year. We confirm that the regional upstream convection related with ENSO teleconnections plays an important role on variations of 𝛿18Op at the inter-annual scale, and more depleted 𝛿18Ov (oxygen stable isotopic composition of vapor) from the northwest of India during La Niña year intensifies the lower 𝛿18Op at Lhasa in La Niña year. Our results have implications for the interpretation of past variations of archives with precipitation stable isotopes such as ice cores, tree rings, lake sediments or speleothems in this region. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

ENSO effects on annual variations of summer precipitation stable isotopes in Lhasa, southern Tibetan Plateau

Loading next page...
 
/lp/ams/enso-effects-on-annual-variations-of-summer-precipitation-stable-AvpvSX1JvL
Publisher
American Meteorological Society
Copyright
Copyright © American Meteorological Society
ISSN
1520-0442
D.O.I.
10.1175/JCLI-D-16-0868.1
Publisher site
See Article on Publisher Site

Abstract

AbstractWhile El Niño-Southern Oscillation (ENSO) influences the Indian summer monsoon, its impact on moisture transport towards the southern Tibetan Plateau (TP) remains poorly understood. Precipitation stable isotopes are the useful indices on climate change in the TP. Classical interpretations of variations of precipitation stable isotopes focus on local surface air temperature or precipitation amount. However, several latest studies suggested they may correlate with large-scale modes of variability, such as ENSO. Here we present a detailed study of ENSO effect on annual variations of 𝛿18Op (oxygen stable isotopic composition of precipitation) at Lhasa in the southern TP for up to ten years. The stable isotopic composition of water vapor from satellite data (Tropospheric Emission Spectrometer (TES)) and simulations from isotopically enabled atmospheric general circulation model (zoomed LMDZiso) are used to explore the mechanism that leads to variations of 𝛿18Op at Lhasa. Statistically significant correlations between 𝛿18Op and ENSO indices (Southern Oscillation index (SOI) and Niño 3.4 Sea Surface Temperature Index (Nino3.4)) are observed. We show that ENSO impacts on the location and intensity of convection over the Arabian Sea, Bay of Bengal and tropical Indian Ocean, along moisture transport paths towards Lhasa; further impacts on convection from the northern Tibetan Plateau. The changing of these convections results in lower 𝛿18Op at Lhasa in 2007 La Niña year and higher 𝛿18Op in 2006 El Niño year. We confirm that the regional upstream convection related with ENSO teleconnections plays an important role on variations of 𝛿18Op at the inter-annual scale, and more depleted 𝛿18Ov (oxygen stable isotopic composition of vapor) from the northwest of India during La Niña year intensifies the lower 𝛿18Op at Lhasa in La Niña year. Our results have implications for the interpretation of past variations of archives with precipitation stable isotopes such as ice cores, tree rings, lake sediments or speleothems in this region.

Journal

Journal of ClimateAmerican Meteorological Society

Published: Nov 8, 2017

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches

$49/month

Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

$588

$360/year

billed annually
Start Free Trial

14-day Free Trial