Centennial-scale linkages between the Indian Summer Monsoon and the solar irradiation from the Gulf of Khambhat (Western India)

Sodhi, Aashima; Das, Archana; Prizomwala, S. P.; Vedpathak, Chintan; Makwana, Nisarg

doi:10.1016/j.quaint.2022.05.011

Cited by 8 publications

(1 citation statement)

References 84 publications

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“…Climatic amelioration (increased Monsoon) during the last 1.0 ka (coincided with the MCA) are recorded in Spiti, Himachal Pradesh (Chauhan et al, 2000), Dokriani valley (Phadtare, 2000), and Bedni, Garhwal Himalaya (Rawat et al, 2021). Moreover, the MCA has been also observed in other paleoclimate records from the Himalayas (Bali et al, 2015(Bali et al, , 2017Dutt et al, 2021;Ghosh et al, 2018;Kar et al, 2002;Quamar, 2020;Sharma and Chauhan, 2001;Singh et al, 2020; Figure 9), central India (Chauhan and Quamar, 2010;Quamar, 2022;Quamar and Bera, 2021;Quamar and Chauhan, 2014;Sinha et al, 2007Sinha et al, , 2011, the Ganga Basin (Singh et al, 2015), Northeast India (Tripathi et al, 2020), Peninsular India (Reddy A et al, 2022), Western India (Quamar et al, 2023a;Sodhi et al, 2022), the BoB (Naidu et al, 2020) and western Arabian Sea (Gupta et al, 2005). Moreover, from Basomtso Lake in the southeastern Tibetan Plateau, warmer climatic conditions and increased glacial meltwater input were suggested between CE 1080 and CE 1140, corresponding well with the MCA (Li et al, 2016).…”

Section: Discussionmentioning

confidence: 62%

Vegetation diversity in response to monsoonal variability in the Eastern Himalaya, India over the past ~13 000 yrs

Dubey,

Ali,

Quamar

et al. 2024

The Holocene

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Monsoon precipitation plays a crucial role in shaping the diversity of vegetation in the Himalayas, both in terms of temporal and spatial distribution. While palynology has traditionally been employed to reconstruct the past climate of the Himalaya, there has been limited understanding of how monsoon-related changes affect the structure and distribution of vegetation. To address this, we analysed pollen data from a 3 m deep sedimentary profile in the higher Sikkim Himalaya to reconstruct monsoon driven changes in vegetation diversity. Our results show a highly fluctuating trend of pollen and diversity parameters at late-Pleistocene-Holocene transition for which fluctuating hydroclimatic conditions and differential pollen preservation in coarser sediments is attributed. During the Early Holocene (10,438–7934 cal yrs BP) favourable hydroclimatic conditions led to a rapid expansion of mixed broad-leaved forests, marked by higher values of richness and alpha diversity. Between 7934 and 5481 cal yrs BP, the region experienced moderate hydroclimatic conditions that facilitated expansion and diversification of woody taxa, and correlated with the global Holocene Climate Optimum (HCO). Conversely, from 5481 to3949 cal yrs BP, declining total pollen count (TPC), species richness, and alpha diversity indicates significant shifts in vegetation composition under deteriorating climatic conditions, which corresponds with the 4.2 ka event worldwide. From 3949 to 2049 cal yrs BP, an increasing yet variable trend in TPC and diversity indices, suggests warm-humid conditions prevailed in the region. During the last 1086 cal yrs, an increasing trend is recorded in the palyno assemblage and diversity parameters suggesting ameliorating climate, matches well with the Mediaeval Climate Anomaly (MCA). Our inferences suggest that the palyno assemblage and diversity parameters are quiet sensitive to warm and humid conditions.

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Section: Discussionmentioning

confidence: 62%

Vegetation diversity in response to monsoonal variability in the Eastern Himalaya, India over the past ~13 000 yrs

Dubey,

Ali,

Quamar

et al. 2024

The Holocene

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Palynological Perspective on Understanding Climate Change in India Over the Pre-industrial Common Era (CE; Past Ca. 2000 Years): a Comprehensive Review and a Critical Evaluation

Quamar

2024

Society of Earth Scientists Series

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Late Holocene Sedimentary Record from Chhari Dhandh, Kachchh, Western India

Singh

Tandon²,

Bhatt³

2023

Journal of the Geological Society of India

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The Chhari Dhandh (lake), located at the periphery of Banni plains, is a lacustrine archive in the hyper arid regime of Kachchh in western India. In the present study, the geochemical proxy approach has been made to reconstruct the signals from the past climate conditions on the core retrieved from the Chhari lake, which is supported by the radiocarbon and optical dating methods. The research identifies five significant climatic events of alternate humid (warm) and dry (cold) climatic conditions spanning the last ~2400 cal yr BP. The signatures of the Roman Warm Period, Cold Dark Ages and Medieval Warm Period suggest the strong archiving potential of this landscape for past climatic signatures. The top part of the sedimentary record also reports climatic conditions resembling the global event of Little Ice Age, but this information is speculative due to a lack of chronological support. The study again highlights the Kachchh landscape as a robust and unique natural laboratory to assess climate and tectonic processes.

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Centennial-scale linkages between the Indian Summer Monsoon and the solar irradiation from the Gulf of Khambhat (Western India)

Cited by 8 publications

References 84 publications

Vegetation diversity in response to monsoonal variability in the Eastern Himalaya, India over the past ~13 000 yrs

Vegetation diversity in response to monsoonal variability in the Eastern Himalaya, India over the past ~13 000 yrs

Palynological Perspective on Understanding Climate Change in India Over the Pre-industrial Common Era (CE; Past Ca. 2000 Years): a Comprehensive Review and a Critical Evaluation

Late Holocene Sedimentary Record from Chhari Dhandh, Kachchh, Western India

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