Cloud Feedbacks from CanESM2 to CanESM5.0 and their influence on climate sensitivity
نویسندگان
چکیده
Abstract. The newest iteration of the Canadian Earth System Model (CanESM5.0.3) has an effective climate sensitivity (EffCS) 5.65 K, which is a 54 % increase relative to model's previous version (CanESM2 – 3.67 K), and highest all current models participating in sixth phase coupled model inter-comparison project (CMIP6). Here, we explore underlying causes behind CanESM5's increased EffCS via comparison forcing feedbacks between CanESM2 CanESM5. We find only modest differences radiative as response CO2 versions. small increases surface albedo longwave cloud feedback, well substantial SW feedback Through use area fraction output kernels, that more positive low non-low shortwave particularly with regards clouds across equatorial Pacific, subtropical extratropical free troposphere optical depth are dominant contributors sensitivity. Additional simulations prescribed sea temperatures reveal spatial pattern temperature change exerts controls on magnitude distribution low-cloud but does not fully explain results from CanESM5 consistent several other CMIP6 models, been primarily attributed changes feedbacks.
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ژورنال
عنوان ژورنال: Geoscientific Model Development
سال: 2021
ISSN: ['1991-9603', '1991-959X']
DOI: https://doi.org/10.5194/gmd-14-5355-2021