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- Title
Linkage between precipitation isotopes and biosphere-atmosphere interaction observed in northeast India.
- Authors
Chakraborty, Supriyo; Burman, Pramit Kumar Deb; Sarma, Dipankar; Sinha, Nitesh; Datye, Amey; Metya, Abirlal; Murkute, Charuta; Saha, Subodh K.; Sujith, Krishnakumar; Gogoi, Nirmali; Bora, Abhijit; Maji, Sabyasachi; Parua, Dipak K.; Bera, S.
- Abstract
The intra-seasonal variation in precipitation isotopes shows a characteristic declining trend over northeast India. As of now, no mechanism offers a consistent explanation of this trend. We have performed the isotopic analysis of precipitation (rain) and estimated net ecosystem exchange and latent heat fluxes using an eddy-covariance system in northeast India. Additionally, we have used a diagnostic model to determine the recycled rainfall in this region. We find a strong link between the enhanced ecosystem productivity and isotopic enrichment in rainwater during the premonsoon season. Subsequently, on the advent of monsoon, the Bay of Bengal generated moisture enters this region and depletes the isotopic values. Additionally, the regional-scale convective activities produce periodic lows in the precipitation isotopes. Contrary to the general understanding, our study shows that the internal factors, such as the local land-atmosphere interactions, rather than the external influences, play a significant role in governing the precipitation isotopes in northeast India.
- Subjects
INDIA; ISOTOPES; LAND-atmosphere interactions; ISOTOPIC analysis; LATENT heat; HEAT flux; RAINWATER
- Publication
NPJ Climate & Atmospheric Science, 2022, Vol 5, Issue 1, p1
- ISSN
2397-3722
- Publication type
Article
- DOI
10.1038/s41612-022-00231-z