Vivek K. Arora
A5053861379- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Plant Water Relations and Carbon Dynamics
- Prostate Cancer Treatment and Research
- Atmospheric chemistry and aerosols
- Hydrology and Watershed Management Studies
- Estrogen and related hormone effects
- Methane Hydrates and Related Phenomena
- Peatlands and Wetlands Ecology
- Climate Change Policy and Economics
- Climate change and permafrost
- Fire effects on ecosystems
- Atmospheric Ozone and Climate
- Remote Sensing in Agriculture
- Meteorological Phenomena and Simulations
- Carbon Dioxide Capture Technologies
- Ecology and Vegetation Dynamics Studies
- Soil Carbon and Nitrogen Dynamics
- Cryospheric studies and observations
- Science and Climate Studies
- CO2 Sequestration and Geologic Interactions
- Plant responses to elevated CO2
- Cancer, Lipids, and Metabolism
- Species Distribution and Climate Change
- Geology and Paleoclimatology Research
Environment and Climate Change Canada
2016-2025
University of Victoria
2014-2024
Climate Centre
2016-2023
Memorial Sloan Kettering Cancer Center
2011-2023
Bristol-Myers Squibb (United States)
2022
Pacific Institute for Climate Solutions
2012-2013
Impact
2013
Natural Resources Canada
2013
Canadian Forest Service
2013
Columbia College
2013
Abstract. Understanding and quantifying the global methane (CH4) budget is important for assessing realistic pathways to mitigate climate change. Atmospheric emissions concentrations of CH4 continue increase, making second most human-influenced greenhouse gas in terms forcing, after carbon dioxide (CO2). The relative importance compared CO2 depends on its shorter atmospheric lifetime, stronger warming potential, variations growth rate over past decade, causes which are still debated. Two...
Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, terrestrial biosphere – “global budget” is important to better understand global cycle, support development climate policies, project future change. Here we describe data sets methodology quantify five major components budget uncertainties. Fossil CO2 (EFF) are based on energy statistics cement production data, while from land use land-use change (ELUC), mainly...
Abstract In the context of phase 5 Coupled Model Intercomparison Project, most climate simulations use prescribed atmospheric CO2 concentration and therefore do not interactively include effect carbon cycle feedbacks. However, representative pathway 8.5 (RCP8.5) scenario has additionally been run by earth system models with emissions. This paper analyzes projections 11 (ESMs) that performed both emission-driven concentration-driven RCP8.5 simulations. When forced emissions, simulate a large...
Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, terrestrial biosphere – global budget is important to better understand cycle, support development climate policies, project future change. Here we describe data sets methodology quantify five major components uncertainties. CO2 from fossil fuels industry (EFF) are based on energy statistics cement production data, respectively, while land-use change (ELUC),...
Abstract. The global methane (CH4) budget is becoming an increasingly important component for managing realistic pathways to mitigate climate change. This relevance, due a shorter atmospheric lifetime and stronger warming potential than carbon dioxide, challenged by the still unexplained changes of CH4 over past decade. Emissions concentrations are continuing increase, making second most human-induced greenhouse gas after dioxide. Two major difficulties in reducing uncertainties come from...
<strong class="journal-contentHeaderColor">Abstract.</strong> The Canadian Earth System Model version 5 (CanESM5) is a global model developed to simulate historical climate change and variability, make centennial-scale projections of future climate, produce initialized seasonal decadal predictions. This paper describes the components their coupling, as well various aspects development, including tuning, optimization, reproducibility strategy. We also document stability using long control...
[1] The response of the second-generation Canadian earth system model (CanESM2) to historical (1850–2005) and future (2006–2100) natural anthropogenic forcing is assessed using newly-developed representative concentration pathways (RCPs) greenhouse gases (GHGs) aerosols. Allowable emissions required achieve atmospheric CO2 pathways, are reported for RCP 2.6, 4.5 8.5 scenarios. For 1850–2005 period, cumulative land plus ocean carbon uptake and, consequently, diagnosed compare well with...
Abstract The magnitude and evolution of parameters that characterize feedbacks in the coupled carbon–climate system are compared across nine Earth models (ESMs). analysis is based on results from biogeochemically, radiatively, fully simulations which CO2 increases at a rate 1% yr−1. These part phase 5 Coupled Model Intercomparison Project (CMIP5). fluxes between atmosphere underlying land ocean respond to changes atmospheric concentration temperature other climate variables....
Abstract. Results from the fully and biogeochemically coupled simulations in which CO2 increases at a rate of 1 % yr−1 (1pctCO2) its preindustrial value are analyzed to quantify magnitude carbon–concentration carbon–climate feedback parameters measure response ocean terrestrial carbon pools changes atmospheric concentration resulting change global climate, respectively. The results based on 11 comprehensive Earth system models most recent (sixth) Coupled Model Intercomparison Project (CMIP6)...
Abstract Leaf phenology remains one of the most difficult processes to parameterize in terrestrial ecosystem models because our understanding physical that initiate leaf onset and senescence is incomplete. While progress has been made at molecular level, for example by identifying genes are associated with flowering selected plant species, a picture controlling only beginning emerge. A variety empirical formulations have used varying degrees success both extratropical tropical biomes. For...
Abstract. Soil is currently thought to be a sink for carbon; however, the response of this increasing levels atmospheric carbon dioxide and climate change uncertain. In study, we analyzed soil organic (SOC) changes from 11 Earth system models (ESMs) contributing simulations Coupled Model Intercomparison Project Phase 5 (CMIP5). We used reduced complexity model based on temperature moisture sensitivities analyze drivers SOC historical high radiative forcing (RCP 8.5) scenarios between 1850...
The carbon cycle is a crucial Earth system component affecting climate and atmospheric composition. response of natural uptake to CO2 change will determine anthropogenic emissions compatible with target pathway. For phase 5 the Coupled Model Intercomparison Project (CMIP5), four future representative concentration pathways (RCPs) have been generated by integrated assessment models (IAMs) used as scenarios state-of-the-art models, enabling quantification for complex, process-based models....
Abstract The ratio of warming to cumulative emissions carbon dioxide has been shown be approximately independent time and scenarios directly relates temperature. It is therefore a potentially important tool for climate mitigation policy. transient response (TCRE), defined as the global-mean at CO2 doubling in 1% yr−1 increase experiment, ranges from 0.8 2.4 K EgC−1 15 models phase 5 Coupled Model Intercomparison Project (CMIP5)—a somewhat broader range than that found previous generation...
Abstract Uncertainties in the 20th century carbon budget associated with treatment of land use change (LUC) are assessed using Canadian Centre for Climate Modelling and Analysis (CCCma) first‐generation Earth System Model (CanESM1). Eight coupled climate cycle simulations performed different reconstructions 1850–2000 cover derived from historical information on changes cropland pasture area. The provide estimates emissions LUC, relative contribution to LUC uncertainty differences among data...
Abstract Peak runoff in streams and rivers of the western United States is strongly influenced by melting accumulated mountain snowpack. A significant decline this resource has a direct connection to streamflow, with substantial economic societal impacts. Observations reanalyses indicate that between 1980s 2000s, there was 10–20% loss annual maximum amount water contained region’s Here we show consistent results from large ensemble climate simulations forced natural anthropogenic changes,...
Abstract. The important role of fire in regulating vegetation community composition and contributions to emissions greenhouse gases aerosols make it a critical component dynamic global models Earth system models. Over 2 decades development, wide variety model structures mechanisms have been designed incorporated into models, which linked different However, there has not yet systematic examination how these strategies contribute performance. Here we describe the structure first phase Fire...
Abstract. Evapotranspiration (ET) is critical in linking global water, carbon and energy cycles. However, direct measurement of terrestrial ET not feasible. Here, we first reviewed the basic theory state-of-the-art approaches for estimating ET, including remote-sensing-based physical models, machine-learning algorithms land surface models (LSMs). We then utilized 4 2 14 LSMs to analyze spatial temporal variations ET. The results showed that ensemble means annual estimated by these three...
Abstract Increasing atmospheric methane (CH 4 ) concentrations have contributed to approximately 20% of anthropogenic climate change. Despite the importance CH as a greenhouse gas, its growth rate and dynamics over past two decades, which include stabilization period (1999–2006), followed by renewed starting in 2007, remain poorly understood. We provide an updated estimate emissions from wetlands, largest natural global source, for 2000–2012 using ensemble biogeochemical models constrained...
Abstract. The Zero Emissions Commitment (ZEC) is the change in global mean temperature expected to occur following cessation of net CO2 emissions and as such a critical parameter for calculating remaining carbon budget. Model Intercomparison Project (ZECMIP) was established gain better understanding potential magnitude sign ZEC, addition processes that underlie this metric. A total 18 Earth system models both full intermediate complexity participated ZECMIP. All conducted an experiment where...
Abstract. Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, terrestrial biosphere – "global budget" is important to better understand global cycle, support development climate policies, project future change. Here we describe data sets methodology quantify five major components budget uncertainties. CO2 from fossil fuels industry (EFF) are based on energy statistics cement production data, respectively, while land-use...