Controls on the isotopic composition of daily precipitation characterized by dual moisture transport pathways at the monsoonal margin region of North-Western India

Lone, Aasif Mohmad; Achyuthan, Hema; Chakraborty, Supriyo; Metya, Abirlal; Datye, Amey; Kripalani, R. H.; Fousiya, A. A.

doi:10.1016/j.jhydrol.2020.125106

Cited by 29 publications

(22 citation statements)

References 53 publications

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“…In the two‐dimensional space of two leading principal components, we use the biplot technique (Gabriel, 1971) to describe the PCA result. This technique is often used for atmospheric applications (Ivanov & Evtimov, 2014; Lone et al., 2020) and GHG studies (Metya et al., 2021). The two axes in the biplot represent the first two principal components, and the arrow vectors describe the variables in this space.…”

Section: Resultsmentioning

confidence: 99%

Isotopic and Concentration Analyses of CO₂ and CH₄ in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Metya

Chakraborty

Bhattacharya

et al. 2021

Earth and Space Science

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Among the natural ecosystems, forests and wetlands emit a sizable amount of carbon dioxide (CO2) and methane (CH4) through autotrophic and heterotrophic respiration and bacterial activities. Interestingly, some evidence suggests that a significant amount of CH4 is generated by the trees in forested ecosystems. The net ecosystem exchange (NEE), measured by the eddy covariance (EC) method, typically represents the net CO2 flux arising from the photosynthetic and respiration processes in the biosphere. This flux is subsequently partitioned into two components, the respired carbon and the assimilated carbon. However, the usual method of partitioning introduces significant errors in each of these fluxes. The present study was undertaken to address this issue where the NEE partitioning was constrained by using the carbon isotopic ratios of CO2. We used a real‐time in situ analyzer in a tropical forest in northeast India, the Kaziranga National Park. The greenhouse gas analyzer provided CO2 and CH4 concentrations, as well as their carbon isotopic ratios. The isotopic data were used to partition the EC‐derived NEE values and derive the isoflux values. Additionally, the isotopic data provided evidence of plant‐generated CH4 in conformity with some recent studies, which requires further investigation.

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Section: Resultsmentioning

confidence: 99%

Isotopic and Concentration Analyses of CO₂ and CH₄ in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Metya

Chakraborty

Bhattacharya

et al. 2021

Earth and Space Science

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“…Precipitation isotopic data on a daily scale has been collected from several locations in India. These sites are Port Blair in the Andaman Islands (data available: 2012-2018; [26,[28][29][30]), Minicoy Island in the Arabian Sea (2015-2018; [31]); Kolkata in east India (2015-2018; [26]); Darjeeling (2013-2018) and Tezpur in northeast India (2016-2018; [26]); Ahmedabad (2007) [25] and Pune in west India (2014-2018; [32,33]), Bandipora in north India (July-2016 to June-2018; [34]) and Kozhikode in south India [22]. Precipitation isotope data of a few sites in Bangladesh have also been used [29,35].…”

Section: Methodsmentioning

confidence: 99%

Statistical Analysis of the Precipitation Isotope Data with Reference to the Indian Subcontinent

Chakraborty¹,

Birmal²,

Burman³

et al. 2021

Hydrology

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The isotopic analysis of precipitation provides useful information on a variety of hydrological and atmospheric processes. The dynamical characteristics of precipitation isotopes have been well investigated, but a systematic study of their statistical behavior seems to be lacking. We have performed the statistical analysis, basically the distribution characteristics of precipitation isotopes visa -vis rainfall data for specific regions. The probability distribution functions of precipitation isotopes have been calculated from local to global scales. It has been observed that the isotopic values, in general, followed a pattern that is similar to the normal distribution, though the rainfall distribution patterns are very different. Under certain circumstances, the isotopic distribution patterns closely resemble the normal distribution, implying a well-constrained moisture source contributing to precipitation. The distribution patterns of oxygen and hydrogen isotopes on continental and global scales show similar behavior. It was observed that the distribution patterns of primary isotopic variables (δ 18 O and δD) are not very sensitive to the outliers. On the contrary, the secondary parameter, d-excess, is very sensitive to outliers, which offers an effective means to quality control of the precipitation isotopic values.

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“…On the other hand, the El Nino‐induced circulation is believed to play a significant role in determining the precipitation isotopes on an interannual timescale (Kiran Kumar & Singh, 2021; Liu et al., 2010). On a shorter timescale, regional circulations impart a dominant role in modulating the precipitation isotopic composition (Lone et al., 2020; Wang et al., 2017). For example, seasonally reversal monsoon circulation plays a crucial role in determining the isotopic composition of precipitation (Araguas‐Araguas et al., 1998; Warrier et al., 2010).…”

Section: Introductionmentioning

confidence: 99%

Modulation of the Precipitation Isotopes by the Dynamic and Thermodynamic Variables of the Atmosphere in Southern Parts of India

Fousiya

Aravind

Achyutan

et al. 2022

Water Resources Research

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Controls on the isotopic composition of daily precipitation characterized by dual moisture transport pathways at the monsoonal margin region of North-Western India

Cited by 29 publications

References 53 publications

Isotopic and Concentration Analyses of CO₂ and CH₄ in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Isotopic and Concentration Analyses of CO₂ and CH₄ in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Statistical Analysis of the Precipitation Isotope Data with Reference to the Indian Subcontinent

Modulation of the Precipitation Isotopes by the Dynamic and Thermodynamic Variables of the Atmosphere in Southern Parts of India

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Controls on the isotopic composition of daily precipitation characterized by dual moisture transport pathways at the monsoonal margin region of North-Western India

Cited by 29 publications

References 53 publications

Isotopic and Concentration Analyses of CO2 and CH4 in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Isotopic and Concentration Analyses of CO2 and CH4 in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Statistical Analysis of the Precipitation Isotope Data with Reference to the Indian Subcontinent

Modulation of the Precipitation Isotopes by the Dynamic and Thermodynamic Variables of the Atmosphere in Southern Parts of India

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Isotopic and Concentration Analyses of CO₂ and CH₄ in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India

Isotopic and Concentration Analyses of CO₂ and CH₄ in Association With the Eddy‐Covariance Based Measurements in a Tropical Forest of Northeast India