Extremes WG Update - NEWS (The NASA Energy and Water cycle ...

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$A 10 year climatology of cloud fraction and vertical distribution ...$

NASA MERRA Revealed Dynamical Organization of the North Pacific AtmosphericRiver Activity by East Asian Cold Surge EventsPrincipal Investigator: Yi Deng (yi.deng@eas.gatech.edu)Atmospheric Rivers (ARs) are narrow regions of intense moisture transport in the troposphere that account for approximately 90% of the totalmeridional moisture transport in the extratropics. They are a primary feature of the global water cycle and are closely tied to water supply and floodrisk in the western U.S. With the NASA MERRA data, this study for the first time revealed that the occurrence frequency of ARs over the easternNorth Pacific is modulated by the East Asian cold surge events in wintertime. The circulation and wind anomalies dynamically excited by the lowtemperaturesof cold surge propagate eastward across the North Pacific and 3 to 5 days later create an environment favorable for the formation of ARsthat can potentially make landfall at the U.S. west coast. East Asian cold surge thus serves as a remote forcing for the western U.S. hydrologicalextremes. This newly identified forcing provides additional dynamical ground for subseasonal prediction of AR activity as well as observationalbenchmark for climate model evaluation. The connection between an energy cycle feature (temperature extremes) and a water cycle feature(hydrological extremes) discovered here shows the unique role the NASA NEWS played in integrating research efforts in the global energy cycle andwater cycle.(a)Atmospheric river(a) (b) (c)(b)Atmospheric riverFigure 2: Height anomalies (color shading, unit: m/k) and water vapor transport anomalies (vector, unit: m/s/k) on850mb level 3 days (a), 4 days (b) and 5 days (c) after the peak of an East Asian cold surge event. All variables have beennormalized by the temperature drop associated with the cold surge. Note the intense moisture transport over westernNorth America associated with the negative (cyclonic) height anomalies that are originally excited by the cold surgeover East Asia.(c)Atmospheric riverFigure 3: Changes in the occurrence probability ofAR over the North Pacific 3-5 days after an EastAsian cold surge event. Note the significant rise ofthe occurrence chance of AR along the U.S. westcoast.Figure 1: Three Atmospheric River (AR) events((a) 10/13/2009, (b) 11/07/2006, (c) 01/09/2005) thatproduced extreme precipitation along the U.S. westcoast as detected from the column integrated totalwater vapor (TQV) field of the NASA MERRA.Unit: mm.Figure 4: Evolution of the total water vapor (TQV) anomaly westof the U.S. coastline after the peak of an East Asian cold surgeevent (lag day 0). Note the significant rise of the level of TQValong the U.S. west coast due to the formation of ARs over theeastern Pacific around lag day 3 (see Figure 2 above). Unit: mm/k (TQV anomaly has been normalized by the temperature dropassociated with the cold surge ).
A Study of Arctic Clouds and Radiation Budget Supported by NASA NEWS ProjectDong, X., B. Xi, K. Crosby, C.N. Long, R. Stone and M. Shupe, 2010: A 10-yr Climatology of ArcticCloud Fraction and Radiative Forcing at Barrow, Alaska. J. Geophys. Res., 115, D17212,SWLWNETArctic cloud Fraction increases significantly fromMarch to May (0.57→0.84), remain relatively high(~0.80-0.9) from May to October, and then decreasefrom November to the following March (0.8→0.57),having an annual average of 0.76.On annual average, the negative SWCRFs and positive LW CRFs nearlycancel, resulting in annual average NETCRF of about 3.5 Wm -2 on the basis of thecombined ARM and BRW analysis.
Page 4 and 5: Goal: use GOES retrieved microphysi
Page 6 and 7: An Integrative study of SGP extreme
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