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Analysis of Global Carbon Cycle Extremes, Their Compound Climate Drivers, and Implications for Terrestrial Carbon Cycle.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Analysis of Global Carbon Cycle Extremes, Their Compound Climate Drivers, and Implications for Terrestrial Carbon Cycle./
作者:	Sharma, Bharat.
面頁冊數:	1 online resource (146 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-07, Section: B.
Contained By:	Dissertations Abstracts International84-07B.
標題:	Climate change. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29995192click for full text (PQDT)
ISBN:	9798363508219

Analysis of Global Carbon Cycle Extremes, Their Compound Climate Drivers, and Implications for Terrestrial Carbon Cycle.
Sharma, Bharat.

Analysis of Global Carbon Cycle Extremes, Their Compound Climate Drivers, and Implications for Terrestrial Carbon Cycle. - 1 online resource (146 pages)

Source: Dissertations Abstracts International, Volume: 84-07, Section: B.

Thesis (Ph.D.)--Northeastern University, 2022.

Includes bibliographical references

Human-induced fossil fuel emissions and land use and land cover change (LULCC), through biogeochemical and biogeophysical processes, alter the climate and modify carbon fluxes such as gross primary production (GPP) and net biospheric production (NBP). Rising surface temperatures - mainly driven by rising atmospheric carbon dioxide concentration - could lead to enhanced evaporation, reduced soil moisture availability, and more frequent droughts and heatwaves. The spatiotemporal co-occurrences of such events further drive extreme anomalies in vegetation productivity and net land carbon storage; thus, increasing the uncertainty of terrestrial ecosystems to act as a net carbon sink. In this dissertation, I quantified the carbon cycle extremes under climate and LULCC forcings, from 1850 to 2300, and attribute them to antecedent single and compound climate drivers at global, and regional scales. Earth System Models suggest that LULCC magnifies the intensity, frequency, and extent of carbon cycle extremes, resulting in a net reduction in expected photosynthetic activity by 10 %. Under a business-as-usual carbon emissions scenario, about 70 % of the regions will experience a growing number of negative extremes in NBP than positive NBP extremes toward the end of 2100. At high latitudes, the positive feedback of temperature and NBP weakens toward the end of the 21st century as the frequency of co-occurrences of high temperatures and negative NBP extremes increases. The disagreements in the characteristics of the interannual variability and extremes in GPP among observations and the models are significant and require an effort from the scientific community to address these uncertainties. More than half of total carbon cycle extremes are driven by the compound effect of dry, hot, and fire events. The single most dominant climate driver of carbon cycle extremes is soil moisture anomalies at both global and regional scales. Fire emerges as the second dominant driver. The number of temperature-driven extremes in the tropics significantly increases over time. Approaches developed in this dissertation will help quantify extreme events in the dependent variables and their attribution to the interactive effect of multiple features at different spatio-temporal scales.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798363508219Subjects--Topical Terms:

2079509
Climate change.
Subjects--Index Terms:

Big data analysisIndex Terms--Genre/Form:

542853
Electronic books.

Analysis of Global Carbon Cycle Extremes, Their Compound Climate Drivers, and Implications for Terrestrial Carbon Cycle.
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