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South Asian monsoon precipitation in CMIP5: a link between inter-model spread and the representations of tropical convection

CMIP5 models exhibit a mean dry bias and a large inter-model spread in simulating South Asian monsoon precipitation but the origins of the bias and spread are not well understood. Using moisture and energy budget analysis that exploits the weak temperature gradients in the tropics, we derived a non-linear relationship between the normalized precipitation and normalized...

Changing circulation structure and precipitation characteristics in Asian monsoon regions: greenhouse warming vs. aerosol effects

. Ruby Leung 3 0 Department of Atmospheric and Oceanic Sciences, University of Maryland , College Park, MD 20740 , USA 1 Climate and Radiation Labora‐ tory, NASA/Goddard Space Flight Center , Greenbelt, MD

Linking deep convection and phytoplankton blooms in the northern Labrador Sea in a changing climate

: Karthik Balaguru, Scott C. Doney. Data curation: Karthik Balaguru, Jin-Ho Yoon. Formal analysis: Karthik Balaguru, Scott C. Doney, Laura Bianucci, Philip J. Rasch, L. Ruby Leung, Jin-Ho Yoon. Funding ... acquisition: Philip J. Rasch, L. Ruby Leung. Investigation: Karthik Balaguru, Scott C. Doney, Laura Bianucci. Supervision: Scott C. Doney. Validation: Karthik Balaguru, Laura Bianucci, Ivan D. Lima

Modeling high-impact weather and climate: lessons from a tropical cyclone perspective

Although the societal impact of a weather event increases with the rarity of the event, our current ability to assess extreme events and their impacts is limited by not only rarity but also by current model fidelity and a lack of understanding and capacity to model the underlying physical processes. This challenge is driving fresh approaches to assess high-impact weather and...

Eddy fluxes and sensitivity of the water cycle to spatial resolution in idealized regional aquaplanet model simulations

A multi-scale moisture budget analysis is used to identify the mechanisms responsible for the sensitivity of the water cycle to spatial resolution using idealized regional aquaplanet simulations. In the higher resolution simulations, moisture transport by eddy fluxes dry the boundary layer enhancing evaporation and precipitation. This effect of eddies, which is underestimated by...

Climate–soil–vegetation control on groundwater table dynamics and its feedbacks in a climate model

Among the three dynamically linked branches of the water cycle, including atmospheric, surface, and subsurface water, groundwater is the largest reservoir and an active component of the hydrologic system. Because of the inherent slow response time, groundwater may be particularly relevant for long time-scale processes such as multi-years or decadal droughts. This study uses...

Regional climate model projections for the State of Washington

Global climate models do not have sufficient spatial resolution to represent the atmospheric and land surface processes that determine the unique regional climate of the State of Washington. Regional climate models explicitly simulate the interactions between the large-scale weather patterns simulated by a global model and the local terrain. We have performed two 100-year...

Role of the atmospheric mean state on the initiation of the Madden-Julian oscillation in a tropical channel model

Tropical channel models, defined as models that are global in the zonal direction but bounded in the meridional direction, are particularly useful for simulating the Madden-Julian oscillation (MJO) and understanding its physical and dynamical basis. Influences from the extratropics through the lateral boundaries have been found to be essential to the reproduction of the...

BioEarth: Envisioning and developing a new regional earth system model to inform natural and agricultural resource management

As managers of agricultural and natural resources are confronted with uncertainties in global change impacts, the complexities associated with the interconnected cycling of nitrogen, carbon, and water present daunting management challenges. Existing models provide detailed information on specific sub-systems (e.g., land, air, water, and economics). An increasing awareness of the...