Scholarlink

<p>We present a high-resolution multiproxy dataset (geochemistry, δ<sup>13</sup>C, and Loss on Ignition) from a 1.25&#xa0;m sediment profile in Gujarat, India, to study Indian Summer Monsoon (ISM) variability during the late Holocene (1400&#xa0;cal&#xa0;yr BP–present). Weak ISM intensity (1400–1150&#xa0;cal&#xa0;yr BP) is indicated by low SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub>, and high δ<sup>13</sup>C, CaO, and CaO/MgO, with TOC/TN &lt; 10. Strengthening ISM (1150–850&#xa0;cal&#xa0;yr BP) aligns with the Medieval Warm Period, marked by increased sediment moisture, δ<sup>13</sup>C, and TOC/TN &gt; 10. A dry phase (850–650&#xa0;cal&#xa0;yr BP) correlates with the Little Ice Age, showing low Al<sub>2</sub>O<sub>3</sub> and Fe<sub>2</sub>O<sub>3</sub>, high CaO, CO<sub>3</sub><sup>−2</sup>, and TOC/TN &lt; 10. Increased precipitation (650–400&#xa0;cal&#xa0;yr BP) shows the contribution of more soluble and mobile elements into the pond. From 400&#xa0;cal&#xa0;yr BP–present is reflected by shifts in δ<sup>13</sup>C, TOC/TN &gt; 10, SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>, and lower CaO/MgO shows less carbonate precipitation due to warm and humid climatic conditions.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

High-resolution Indian summer monsoon (ISM) records during the last 1400 yrs BP from the Mahi river basin, Mainland Gujarat, India

  • 期刊论文

  • 发表日期：

    2025年1月24日

查看全文
  • Kamlesh Kumar,
  • Anupam Sharma,
  • Shailesh Agrawal

摘要

We present a high-resolution multiproxy dataset (geochemistry, δ13C, and Loss on Ignition) from a 1.25 m sediment profile in Gujarat, India, to study Indian Summer Monsoon (ISM) variability during the late Holocene (1400 cal yr BP–present). Weak ISM intensity (1400–1150 cal yr BP) is indicated by low SiO2, Al2O3, Fe2O3, and high δ13C, CaO, and CaO/MgO, with TOC/TN < 10. Strengthening ISM (1150–850 cal yr BP) aligns with the Medieval Warm Period, marked by increased sediment moisture, δ13C, and TOC/TN > 10. A dry phase (850–650 cal yr BP) correlates with the Little Ice Age, showing low Al2O3 and Fe2O3, high CaO, CO3−2, and TOC/TN < 10. Increased precipitation (650–400 cal yr BP) shows the contribution of more soluble and mobile elements into the pond. From 400 cal yr BP–present is reflected by shifts in δ13C, TOC/TN > 10, SiO2/Al2O3, and lower CaO/MgO shows less carbonate precipitation due to warm and humid climatic conditions.