Investigating the dynamical behavior of the Intertropical Convergence Zone since the last glacial maximum based on terrestrial and marine sedimentary records

Mukherjee, Pami; Sinha, Nitesh; Chakraborty, Supriyo

doi:10.1016/j.quaint.2016.08.030

Cited by 8 publications

(5 citation statements)

References 69 publications

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“…) also suggest that the ISM was indeed stronger at that time. Interestingly, proxy-based (Mukherjee et al, 2016) and model-based studies suggest that external factors such as changes in the orbital parameters, changes in solar forcing induced by volcanic eruptions, land surface, and vegetation changes, etc., may have played an important role in evolving a distinct climate of the Earth during MH relative to the current day (Crétat et al, 2020). The present study, through various experiments with the Community Atmospheric Model (CAM5), examines the potential role that the distinct orbital parameters during the MH may have played in the manifestation of mean ISM conditions during the MH.…”

Section: Conclusion and Scope For Future Studiesmentioning

confidence: 99%

The Importance of the Orbital Parameters for the Indian Summer Monsoon During the Mid-Holocene, as Deciphered From Atmospheric Model Experiments

2021

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Proxy and model-based studies suggest multi-scale temporal variability in the Indian summer monsoon (ISM). In this study, using the CESM1 atmospheric general circulation model, we carried out multiple ensemble AGCM simulations for the Mid-Holocene (MH; ≈ 6 kyr BP), Medieval Warm Period (MWP; ≈ 1 kyr BP), Little Ice Age (LIA; ≈ 0.35 kyr BP), and Historical (HS; ≈ CE 2000) periods. We used the PMIP3/CMIP5 boundary conditions for this purpose. Our simulations indicate that the ISM during the MH was stronger compared to HS and the rainfall higher, in agreement with several proxy studies. The experiments also suggest that the ISM rainfall (ISMR) was higher during MWP relative to the LIA in agreement with our earlier results from the PMIP3 models. A relatively northward migration of the ITCZ over the Indian region and strengthening of the neighboring subtropical high over the northwestern Pacific, both associated with stronger insolation associated with the obliquity and precision during the MH, seem to be important reason Indian summer monsoon during the MH.

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Section: Conclusion and Scope For Future Studiesmentioning

confidence: 99%

The Importance of the Orbital Parameters for the Indian Summer Monsoon During the Mid-Holocene, as Deciphered From Atmospheric Model Experiments

2021

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Section: Introductionmentioning

confidence: 99%

“…Except for the seasonal cycle variation, extreme interannual northward shift of the ITCZ may lead to severe droughts through circulation and precipitation changes (Weller et al, 2014). Since changes in the position and structure of the ITCZ affect the tropical and extratropical climate on various time scales (Mukherjee et al, 2017), it is essen tial to understand how it responses to climate change.Previous studies have investigated how the ITCZ changes in a warming climate. Satellite observations and reanalysis data suggest that the ITCZ in the Atlantic and Pacific oceans has narrowed and strengthened in recent…”

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confidence: 99%

Last Glacial Maximum ITCZ Changes From PMIP3/4 Simulations

Wang

Jiang

2023

JGR Atmospheres

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The intertropical convergence zone (ITCZ) is the region near the equator where the trade winds of the Northern and Southern Hemispheres converge. It appears as a band of heavy precipitation that encircles the globe. The annual precipitation in the ITCZ accounts for 32% of the globally integrated precipitation in the current climate (Kang et al., 2018). The ITCZ has an important impact on the Earth's climate. In the tropics, the ITCZ modulates cyclone genesis and the convective initiation of the Madden-Julian Oscillation (Wang & Magnusdottir, 2006;Zelinsky et al., 2019). The ITCZ also interacts with subtropical circulations and monsoon systems through the Hadley cell (Song et al., 2018;Watt-Meyer & Frierson, 2019;Zhou et al., 2019). The onset of the boreal summer monsoon is triggered by the annual northward shift of the ITCZ (Geen et al., 2020;Linsley et al., 1994). Except for the seasonal cycle variation, extreme interannual northward shift of the ITCZ may lead to severe droughts through circulation and precipitation changes (Weller et al., 2014). Since changes in the position and structure of the ITCZ affect the tropical and extratropical climate on various time scales (Mukherjee et al., 2017), it is essen tial to understand how it responses to climate change.Previous studies have investigated how the ITCZ changes in a warming climate. Satellite observations and reanalysis data suggest that the ITCZ in the Atlantic and Pacific oceans has narrowed and strengthened in recent

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“…Further, our data is also in correspondence with that of ocean data sets suggesting similar ocean-atmospheric conditions relative to present and matches well even with the mid-Holocene period (ca. 6000 yrs BP) 65 , 66 . The fluctuating decreasing trend in the rainfall pattern post ~6 ka is attributed to the progressive decrease in insolation and south ward shift of the ITCZ after mid Holocene.…”

Section: Introductionmentioning

confidence: 99%

High frequency abrupt shifts in the Indian summer monsoon since Younger Dryas in the Himalaya

Ali

Dubey

Ghosh

et al. 2018

Sci Rep

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In order to quantify the Indian summer monsoon (ISM) variability for a monsoon dominated agrarian based Indian socio-economy, we used combined high resolution δ13C, total organic carbon (TOC), sediment texture and environmental magnetic data of the samples from a ~3 m deep glacial outwash sedimentary profile from the Sikkim Himalaya. Our decadal to centennial scale records identified five positive and three negative excursions of the ISM since last ~13 ka. The most prominent abrupt negative ISM shift was observed during the termination of the Younger Dryas (YD) between ~11.7 and 11.4 ka. While, ISM was stable between ~11 and 6 ka, and declined prominently between 6 and 3 ka. Surprisingly, during both the Medieval Warm Period (MWP) and Little Ice age (LIA) spans, ISM was strong in this part of the Himalaya. These regional changes in ISM were coupled to southward shifting in mean position of the Intertropical Convergence Zone (ITCZ) and variations in East Asian monsoon (EAM). Our rainfall reconstructions are broadly in agreement with local, regional reconstructions and PMIP3, CSIRO-MK3L model simulations.

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Investigating the dynamical behavior of the Intertropical Convergence Zone since the last glacial maximum based on terrestrial and marine sedimentary records

Cited by 8 publications

References 69 publications

The Importance of the Orbital Parameters for the Indian Summer Monsoon During the Mid-Holocene, as Deciphered From Atmospheric Model Experiments

The Importance of the Orbital Parameters for the Indian Summer Monsoon During the Mid-Holocene, as Deciphered From Atmospheric Model Experiments

Last Glacial Maximum ITCZ Changes From PMIP3/4 Simulations

High frequency abrupt shifts in the Indian summer monsoon since Younger Dryas in the Himalaya

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