English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Mid-late Holocene sub-millennial scale inverse trends of South Asian summer and winter monsoons in Sri Lanka

Gayantha, K., Roberts, P., Routh, J., Wedage, O., Ott, F., Frenzel, P., et al. (2021). Mid-late Holocene sub-millennial scale inverse trends of South Asian summer and winter monsoons in Sri Lanka. Frontiers in Earth Science, 9: 1244. doi:10.3389/feart.2021.789291.

Item is

Files

show Files
hide Files
:
shh3119.pdf (Publisher version), 4MB
Name:
shh3119.pdf
Description:
OA
OA-Status:
Visibility:
Public
MIME-Type / Checksum:
application/pdf / [MD5]
Technical Metadata:
Copyright Date:
-
Copyright Info:
-

Locators

show
hide
Locator:
Supplementary Figures and tables (Supplementary material)
Description:
(last seen: Jan. 2022)
OA-Status:

Creators

show
hide
 Creators:
Gayantha, Kasun, Author
Roberts, Patrick1, Author           
Routh, Joyanto, Author
Wedage, Oshan1, Author           
Ott, Florian1, Author           
Frenzel, Peter, Author
Chandrajith, Rohana, Author
Gleixner, Gerd, Author
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

Content

show
hide
Free keywords: paleoclimate, Indian Ocean Monsoon, ITCZ, South Asia, biomarker, compound specific isotopes analysis, XRF, microfauna
 Abstract: The South Asian Monsoon (SAM) brings precipitation crucial for agriculture across the densely populated region of South Asia. Identifying the key long-term drivers of the SAM is essential to improve the predictability of future monsoonal trends in the context of current global climate scenarios and increasingly frequent drought and flooding events in this part of the world. Here, we reconstruct ∼6000 years of climatic and environmental history of the South Asian summer monsoon-fed Bolgoda South Lake and the Horton Plains, and the winter monsoon-fed Panama lagoon, in Sri Lanka to better understand monsoonal operation over this island and its connection to broader climate systems. Multiple proxies (diagnostic biomarkers, hydrogen and carbon isotopes of individual n-alkane, grain size, and Zr/Rb elemental ratio) indicate a sub-millennial scale decreasing trend of summer monsoon rainfall in the wet zone of Sri Lanka alongside an increasing trend of winter monsoon rainfall in the dry zone during the last ∼6000 years. We also observed multi-centennial scale arid events in the Bolgoda South Lake and Horton Plains records at ∼3,500 and ∼1,000 cal years BP. Inverse monsoonal behavior during the mid- and late Holocene seems to be led by the southward migration of the mean latitudinal position of ITCZ, induced by varying solar energy distribution between the Northern and Southern hemispheres due to Earth’s processional cycle. Our observations are broadly supported by existing paleoclimatic records from the Indian sub-continent, but abrupt arid phases are asynchronous in the regional records. In addition, these short-term arid conditions do not show systematic correlations with the different modes of climate variables known to have teleconnections with the Indian Ocean monsoon.

Details

show
hide
Language(s): eng - English
 Dates: 2021-12-14
 Publication Status: Published online
 Pages: 21
 Publishing info: -
 Table of Contents: Introduction
Study area
- Climate, Topography, and Vegetation of Sri Lanka
- The Study Sites
- Bolgoda South Lake
- Panama Lagoon
- Horton Plains
Materials and methods
- Sampling/Sediment Core Collection
- 14C Dating and Construction of Age-Depth Models
- Grain Size Analysis
- X-Ray Fluorescence Core Scanning
- Total Organic Carbon Analysis
- Biomarker Extraction and Analysis
- Compound Specific Isotope Analysis of n-Alkanes
- Statistical Analysis
Results
- Stratigraphy and Chronology
- Biomarker Variation
- Compound Specific Carbon and Hydrogen Isotope Variation in n-Alkanes
- Total Organic Carbon
- Grain Size Distribution and Zr/Rb Log-Ratio
Discussion
- Behavior of Monsoon Rainfall and Environmental Impacts in Sri Lanka
- South Asian Monsoon During the Middle and Late Holocene
- Mid-Late Holocene Human-Environment Interactions in Sri Lanka
Conclusion
 Rev. Type: Peer
 Identifiers: DOI: 10.3389/feart.2021.789291
Other: shh3119
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Frontiers in Earth Science
  Abbreviation : Front. Earth Sci.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Lausanne : Frontiers Media
Pages: - Volume / Issue: 9 Sequence Number: 1244 Start / End Page: - Identifier: ISSN: 2296-6463
CoNE: https://pure.mpg.de/cone/journals/resource/2296-6463