CW3E Welcomes Dr. Scott Sellars

CW3E welcomes Dr. Scott Sellars

April 25, 2016

Dr. Scott L. Sellars has joined CW3E at the Scripps Institution of Oceanography to work on improving the understanding and forecasting of hydrologic extremes and their impacts on water resource management in the Western United States. Scott’s previous research has been in the area of hydrometeorology and climate, with a particular focus on computational science methodologies applied to remote sensing information for understanding connections between weather and hydrological events. He has previously held appointments at the University of California, Irvine, Columbia University’s Columbia Water Center (CWC), Geophysical Fluid Dynamics Laboratory (GFDL) and the International Research Institute for Climate and Society (IRI). His Ph.D. is on seasonal hydrometeorological prediction, awarded in 2014, and was undertaken at the University of California, Irvine.

CW3E Welcomes Brian Kawzenuk

CW3E welcomes Brian Kawzenuk

March 30, 2015

CW3E is pleased to welcome Brian Kawzenuk as a staff research associate. Brian joins us from completing his master’s work with Dr. Jason Cordeira at Plymouth State University in New Hampshire. At Plymouth Brian investigated the impacts of land-falling atmospheric rivers (ARs) on the west coast during February 2014. The structure and dynamics of AR events as well as their influence on extreme precipitation over the west coast were explored. Brian looks forward to continuing his study of AR events and using his extensive analytic and programming skills to help the CW3E team develop stakeholder tools. Brian grew up in central New York State and has always had a passion for meteorology. We’re delighted to welcome him to the team and hope he enjoys the milder climate of the La Jolla region.

CW3E Welcomes Dr. Andrew Martin

CW3E welcomes Dr. Andrew Martin

August 12, 2014

Dr. Andrew Martin has joined the Center for Western Weather and Water Extremes to assist in developing a specialized numerical weather prediction system tailored to predicting extreme precipitation events in the West. Andrew is also actively involved in planning CW3E’s participation in the multi-agency CalWater-2 field campaign. Dr. Martin has a background in aerosols in numerical weather prediction, specifically in cloud microphysics and shortwave radiation models. He received his PhD in meteorology from Florida State University in 2012. Under the direction of T. N. Krishnamurti, Andrew focused on black carbon aerosols and their direct radiative impact on the onset phase of the South Asian summer monsoon. After FSU, Dr. Martin accepted a postdoctoral appointment with Dr. Kim Prather’s group at the University of California, San Diego. Andrew worked with Dr. Prather to support the CalWater project using detailed numerical simulation of the impact of ice nucleating aerosols on North Pacific winter storms, including Atmospheric Rivers. Andrew hails from Albuquerque, NM. The southwestern United States, and the Rocky Mountains in particular, motivated his interest in water resources, mountain winter storms and monsoons. The western environment continues to feed Andrew’s extracurricular interests, which include backpacking, skiing, trail running and bicycling.

CW3E Welcomes Dr. Julie Kalansky

CW3E welcomes Dr. Julie Kalansky

September 28, 2014

Julie joins CW3E as a Post-doctoral scholar after earning her PhD at Rutgers University earlier this year with Yair Rosenthal as her advisor. Her dissertation focused on the relationship between past climate and ocean circulation, and was entitled “Internal and Forced Variability of the Equatorial Pacific on Millennial and Centennial Time Scales”. Using Mg/Ca ratios from microfossils to reconstruct past water column temperatures she showed that the subsurface in the equatorial Pacific is important in storing and transferring heat during climate perturbations. Having grown up in California, she is excited to be back and working on research that is relevant to communities on the West coast. She looks forward to working with her colleagues to study linkages between short-term climate variability and extreme events on the west coast, and to help communicate the importance of atmospheric rivers and the latest scientific findings from CW3E to water managers and the broader community.

CW3E welcomes Dr. David Lavers

CW3E welcomes Dr. David Lavers

September 12, 2016

Dr. David Lavers has joined CW3E at the Scripps Institution of Oceanography to work on improving understanding and forecasting of hydrologic extremes in the western United States. David’s previous research has been in the area of hydrometeorology, with a particular focus on atmospheric rivers (ARs). His work has included studying the connection between ARs and extreme precipitation and flood events across Europe and the Central United States, and investigating how ARs may change in the future. He has previously held appointments at the European Centre for Medium-Range Weather Forecasts, the University of Iowa, Princeton University, and the University of Reading UK. His PhD on seasonal hydrological prediction, awarded in 2011, was undertaken at the Centre for Ecology and Hydrology (Wallingford) UK, and the University of Birmingham UK. Away from work David enjoys outdoor pursuits including hiking and cycling.

Mike Dettinger elected AGU Fellow

CW3E congratulates Mike Dettinger – 2014 AGU Fellow<

July 30, 2014

CW3E congratulates PI Dr. Michael Dettinger’s election to AGU’s 2014 class of Fellows. This honor is a compliment to Mike’s long career and is presented with the citation “For insightful and useful research in understanding how climate and weather affect the variability of hydrologic systems”. Only one in a thousand members is elected AGU Fellow each year so this is a prestigious achievement. CW3E PI and colleague Dr. Dan Cayan notes “Mike was among the first to explain how hydrologic variability is organized across continental to global scales. Mike’s contributions also include new insights about how longer period climate variation may affect shorter period hydrologic phenomena. Mike’s recent emphasis on understanding North Pacific storms, with close ties to Marty Ralph and colleagues, has produced a sharper image of how “atmospheric rivers” produce most of the floods along the West Coast and deliver a large portion of its water supply.”

CW3E welcomes Reuben Demirdjian

CW3E welcomes Reuben Demirdjian

June 24, 2014

CW3E is pleased to welcome Reuben Demirdjian. Reuben joins CW3E to pursue his doctoral degree at Scripps Institution of Oceanography. Reuben completed his undergraduate degree at UC Santa Barbara in physics. “I met Dr. Ralph at the Scripps Open House and was impressed with the group he is building and his enthusiasm for understanding the role atmospheric rivers play in the precipittion regime of California and the western US,” Reuben said. Reuben is getting a head start this summer learning tools, especially the WRF (Weather, Research and Forecasting) model, and use of dropsonde observations from research aircraft.

Publication Notice: Chemical properties of insoluble precipitation residue particles

CW3E Publication Notice

Chemical properties of insoluble precipitation residue particles

Jessie Creamean posing for a photo while clearing snow from the top of the NOAA trailer at Sugar Pine Dam after the storm on 2/25/11.

This article provides an in-depth analysis of resuspended residues from precipitation samples collected at a remote site in the Sierra Nevada Mountains in California during the 2009-2011 winter seasons. These residues may be used as a benchmark for classification of insoluble precipitation. Knowledge of the precipitation chemistry of insoluble residues coupled with meteorological and cloud microphysical measurements will ultimately improve our understanding of the link between aerosols, clouds, and precipitation.

This paper represents a significant milestone from the CalWater experiment, which is led by members of UCSD/Scripps’ new Centers on aerosols (CAICE) and extreme events (CW3E), as well as NOAA, DOE, NASA, USGS. It also highlights the multi-disciplinary research stimulated by CalWater, and the partnerships between key researchers across organizations. The lead author, Jessie Creamean, received her PhD in atmospheric chemistry from UCSD under Kim Prather using CalWater data, and is now bringing that expertise to a primarily meteorological group in NOAA as she pursues emerging topics in aerosol-precipitation interactions in collaboration with CW3E scientists.

A personal use copy of the article is available here.

CalWater-ACAPEX 2015 Planning Workshop

CalWater-ACAPEX 2015 Planning Workshop

Scripps Institution of Oceanography

La Jolla, California

CalWater 2 Co-Leads: Marty Ralph, Kim Prather, Dan Cayan (Scripps)

Organizing Committee: Chris Fairall (NOAA), Ruby Leung (PNNL), Andrew Martin (Scripps), Ryan Spackman (NOAA/STC)

CalWater2 – ACAPEX Observational Strategy Winter 2014-15

CalWater-2 took major steps from vision to reality on 22-24 April 2014 at Scripps Institution of Oceanography when roughly 40 key individuals (scientists, engineers, aircraft and ship managers, and students) met to plan for major field deployments in 2015. The following facilities are committed (or nearly so) to a field campaign between roughly 10 January and 10 March 2015:

  • DOE – G-1 aircraft
  • DOE AMF-2 ocean-atmosphere facility on the NOAA Research Vessel (ship) Ron Brown
  • NOAA G-IV aircraft
  • NOAA P-3 aircraft
  • ATOFMS mobile, land-based aerosol-sensor suite
  • EFREP hydrometeorological Mesonetwork in California

The DOE facilities are part of the ARM Cloud Aerosol Precipitation Experiment (ACAPEX) experiment addressing (1) aerosol impacts on clouds and precipitation and (2) atmospheric rivers. The NOAA facilities were requested also based on the CalWater vision, with an emphasis on atmospheric-river science questions.

The workshop concluded with a plan for specific start and end dates for each facility, narrowed options for where to operate them, a plan for a field operations center (and a specific possible location), strategies for developing coordinated ship and aircraft operations, and plans for the forecasting capabilities needed to guide missions. In addition, the 12-member CalWater Core Scientific Steering Group met afterword and reviewed plans for 2016-2018 and strategies to advance the longer term Calwater Vision. The Steering Group committed to organizing two special sessions and a side meeting (for last minute coordinations of the 2015 CalWater and ACAPEX activities) at the Fall Meeting of AGU in December 2014, and a journal article describing the program. The proposed AGU sessions are:

  1. CalWater Theme 1: Cloud-Aerosol-Precipitation Interactions in California (Conveners: Daniel Rosenfeld, Kimberly Prather),
  2. Atmospheric Rivers: Observations, Dynamics, Modeling, Impacts and Applications (Conveners: Marty Ralph, Duane Waliser, Jason Cordeira).

The presentations from the Workshop are available here.

Workshop Sponsored by:

  • Scripps, Center for Western Weather and Water Extremes (CW3E)
  • Scripps Center for Aerosol Impacts on Climate and the Environment (CAICE)
  • Science and Technology Corporation (STC)

Workshop Sponsored by:Workshop Participants

Photo of most workshop participants at the CalWater 2015 – ACAPEX workshop at Scripps, April 2014.

CalWater2 Workshop Participants