Major Events

Information about the following special event is available here:

CFMIP/WCRP/ICTP Conference on Cloud Processes, Circulation and Climate Sensitivity

To be held July 4-7, 2016, at the International Center for Theoretical Physics in Trieste, Italy.
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+ Past Meetings & Workshops

Other Upcoming Events

Following are upcoming seminars, workshops and other events of interest to GISS staff and our research partners. Please note that due to security regulations, these presentations are not open to the general public.

Wednesday, May. 25, 2016
12:45 p.m. to 2:30 p.m.
GISS Lunch Seminar
Speaker: Elizabeth Fischer (GISS)
Contact: Bastiaan van Diedenhoven
Friday, May. 27, 2016
11:00 a.m. to 12:30 p.m.
Friday Seminar
Topic: The importance of aerodynamic entrainment for dust emission
Speaker: Martina Klose (USDA-ARS Jornada Experimental Range)
Abstract: Read More
Contact: Jan Perlwitz

Friday Seminar
Speaker: Martina Klose (USDA-ARS Jornada Experimental Range)
Title: The importance of aerodynamic entrainment for dust emission

Abstract: Dust emission is a key process for soil-nutrient and carbon transport not only in many arid and semi-arid regions of the world, but also in agricultural areas in a moderate climate. Three dust emission mechanisms are commonly referred to in aeolian research: saltation bombardment, aggregate disintegration, and aerodynamic entrainment. Saltation bombardment and aggregate disintegration are considered the most efficient dust emission mechanisms, but the relative importance of each mechanism varies with soil surface condition and atmospheric forcing. Understanding of the mechanisms of aeolian sediment transport and their relative importance is necessary to estimate the amount and frequency of dust emission and their impacts on ecosystems and climate. Atmospheric turbulence generates intermittently large surface shear stresses and can effectively entrain dust into the atmosphere. Dust emission caused by convective turbulence is referred to as "Convective Turbulent Dust Emission" (CTDE) and is considered the most important form of direct aerodynamic dust entrainment. CTDE occurs predominantly at weak mean wind conditions, when the buoyancy contribution to turbulence production is most pronounced. Under such conditions, loose dust particles at the soil surface can be easily entrained by CTDE. This process is so far not included in commonly used dust emission schemes and therefore the significance of CTDE for the global dust budget and its impacts on the Earth system remain largely unknown. A parameterization for CTDE is presented. The scheme is coupled to the WRF-Chem model in LES (Large-Eddy Simulation) and in regional mode to investigate the process and its significance for local and regional scale dust emissions. In LES mode, numerical experiments are used to support the development of the regional parameterization and to investigate the dust emission by dust devils. For the first time, a method is proposed to estimate the contribution of dust devils to the dust budget based on size-resolved dust fluxes of a dust devil population. Coupled to WRF-Chem in regional mode, the dust emission scheme is applied to estimate the sediment transported by CTDE in Australia during one year of simulation time and to assess the importance of the process compared to other dust emission mechanisms.

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Friday, Jul. 15, 2016
11:00 a.m. to 12:30 p.m.
Friday Seminar
Topic: Reconstruction of South China Sea Surface Ocean Circulation Driven by the Winter Monsoon using Coral delta14C
Speaker: Nathalie Goodkin (Climate, Earth Observatory of Singapore)
Abstract: Read More
Contact: Darren Engwirda

Friday Seminar
Speaker: Nathalie Goodkin (Climate, Earth Observatory of Singapore)
Title: Reconstruction of South China Sea Surface Ocean Circulation Driven by the Winter Monsoon using Coral delta14C

Abstract: A record of surface ocean circulation (delta14C) from 1584-1950 from a coral collected off the western coast of Nha Trang, Vietnam reveals a significant correlation to regional winter sea level pressure (SLP) and sea surface temperature (SST). The record spans from 1584-1950. High frequency (2-5 years per cycle) spectral variability in the record coincides with power in reconstructions of the Siberian High Index (SHI, D'Arrigo et al., 2005a), El Nino Southern Oscillation (ENSO, D'Arrigo et al., 2005b) and Arctic Oscillation (AO, Li and Wang, 2003). Spectral power at all frequencies increases during the Little Ice Age relative today indicating that wind driven surface advection was more variable when hemispheric temperatures were cooler. Decadal variance in the past 100 years is correlated to variance records of the AO, allowing for a long-term analysis of how this system interacted with the winter monsoon over the past 400 years.

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Thursday, Sep. 15, 2016
11:00 a.m. to 12:30 p.m.
Climate Center Lecture
Speaker: Stephen Meyers (University of Wisconsin)
Abstract: Read More
Contact: Allegra N. LeGrande

Climate Center Lecture
Speaker: Stephen Meyers (University of Wisconsin)

Abstract: Climate Center (LDEO/GISS) Lecture

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This event listing was last updated 2016-05-24.

Seminars & Colloquia

Most seminars at GISS are held during the academic year, September through May.

Formal seminar presentations by visiting scientists are held many Fridays at 11:00 a.m.

Informal lunchtime presentations by NASA GISS staff take place on Wednesdays at 1:00 p.m. about twice per month.

Other special seminars occur from time to time as visitors' schedules permit.

Security Note

Regulations require that visitors arrange in advance for a building pass. Persons attending a NASA GISS seminar or colloquium should contact the event host at least two days in advance of the event for assistance. Please include your affiliation in your e-mail.

Effective July 21, 2014, the implementation of Phase II of the Real-ID Act (2005) restricts the use of state ID from non-compliant states (including New York) as an acceptable form of identification for federal facilities such as NASA GISS. If you are scheduled to visit GISS and only have a standard driver's license from a non-compliant state, please be sure to bring a second form of ID (passport, military ID, etc.).

Special arrangements must be made for persons who are not U.S. citizens or U.S. permanent residents. Such persons planning to attend a NASA GISS event should contact the event host at least 2 days in advance of visiting GISS.