David Helweg, Ph.D. (Former Employee)
Science and Products
Vegetation and Water Monitoring Datasets for selected locations in the Republic of the Marshall Islands from 2017-2022
The Republic of the Marshall Islands (RMI) is a sovereign Small Island State in the tropical central North Pacific Ocean. RMI is a nation of more than thirty atolls and islands, most of which are inhabited, dispersed across an exclusive economic zone (EEZ) over 2 million square kilometers. This data release contains raster datasets for vegetation and water monitoring including Normalized...
Monthly Satellite-Estimated Precipitation Reports for the Republic of the Marshall Islands (ver. 2.1, January 2025)
The Republic of the Marshall Islands (RMI) is a nation of more than thirty low-lying atolls and islands, most of which are inhabited, dispersed across an Exclusive Economic Zone (EEZ) over 770,000 square miles in the tropical central North Pacific Ocean. Monitoring environmental conditions for potential drought risk is challenging in such a dispersed Island nation, and current drought...
Satellite precipitation estimates for selected locations in the Republic of the Marshall Islands (ver. 3.0, January 2025)
The Republic of the Marshall Islands (RMI) is a sovereign Small Island State in the tropical central North Pacific Ocean. RMI is a nation of more than thirty atolls and islands, most of which are inhabited, dispersed across an exclusive economic zone (EEZ) over 2 million square kilometers. This data release contains files of daily precipitation estimates beginning in 2001 for 23...
Developing version 2 of satellite-estimated precipitation monthly reports for selected locations in the Republic of the Marshall Islands
The Republic of the Marshall Islands (RMI; also known as the Marshall Islands) is a nation of more than 30 low-lying atolls and islands, most of which are inhabited, dispersed across an Exclusive Economic Zone over 770,000 square miles in the tropical central north Pacific Ocean. The study objectives and methods were originally presented in U.S. Geological Survey Data Report 1181 and are...
Authors
Gabriel B. Senay, David A. Helweg, Stefanie Bohms, Thomas Cecere, Tiare Eastmond, Amy Koch, Kurtis Nelson, Jack Randon
Developing satellite-estimated precipitation monthly reports for selected locations in the Republic of the Marshall Islands
The Republic of the Marshall Islands (also known as the Marshall Islands) is a nation of more than 30 low-lying atolls and islands, most of which are inhabited, dispersed across an Exclusive Economic Zone over 770,000 square miles in the tropical central north Pacific Ocean. Monitoring environmental conditions for potential drought risk is challenging in such a dispersed island nation...
Authors
Gabriel B. Senay, David A. Helweg, Stefanie Bohms, John W. Taylor, Thomas Cecere, Tiare Eastmond, Amy Koch, Kurtis Nelson, Lajikit Rufus
A century of drought in Hawai‘i: Geospatial analysis and synthesis across hydrological, ecological, and socioeconomic scales
Drought is a prominent feature of Hawaiʻi’s climate. However, it has been over 30 years since the last comprehensive meteorological drought analysis, and recent drying trends have emphasized the need to better understand drought dynamics and multi-sector effects in Hawaiʻi. Here, we provide a comprehensive synthesis of past drought effects in Hawaiʻi that we integrate with geospatial...
Authors
Abby G. Frazier, Christian P. Giardina, Thomas Giambelluca, Laura Brewington, Yi-Leng Chen, Pao-Shin Chu, Lucas Fortini, David Helweg, Victoria W. Keener, Ryan J. Longman, Matthew P Lucas, Alan Mair, Delwyn S. Oki, Julian J Reyes, Stephanie G. Yelenik, Clay Trauernicht
Managing effects of drought in Hawai’i and U.S.-affiliated Pacific Islands
How is drought expressed in Hawai‘i & USAPI? Drought is a significant climate feature in Hawai‘i and the U.S.-Affiliated Pacific Islands (USAPI), at times causing severe impacts across multiple sectors. Below average precipitation anomalies are often accompanied by higher than average temperatures and reduced cloud cover. The resulting higher insolation and evapotranspiration can magnify...
Authors
Abby G. Frazier, Jonathan Deenik, Neal Fujii, Greg Funderburk, Thomas Giambelluca, Christian P. Giardina, David A. Helweg, Victoria W. Keener, Donald Mair, John J. Marra, Sierra McDaniel, Lenore Ohye, Delwyn S. Oki, Elliott W.R. Parsons, Ayron Strauch, Clay Trauernicht
Hawai‘i and U.S.-Affiliated Pacific Islands
The U.S. Pacific Islands are culturally and environmentally diverse, treasured by the 1.9 million people who call them home. Pacific islands are particularly vulnerable to climate change impacts due to their exposure and isolation, small size, low elevation (in the case of atolls), and concentration of infrastructure and economy along the coasts.A prevalent cause of year-to-year changes...
Authors
Victoria W. Keener, David Helweg, Susan Asam, Seema Balwani, Maxine Burkett, Charles Fletcher, Thomas Giambelluca, Zena Grecni, Malia Nobrega-Olivera, Jeffrey Polovina, Gordon Tribble
Report from the workshop on climate downscaling and its application in high Hawaiian Islands, September 16–17, 2015
In the subtropical and tropical Pacific islands, changing climate is predicted to influence precipitation and freshwater availability, and thus is predicted to impact ecosystems goods and services available to ecosystems and human communities. The small size of high Hawaiian Islands, plus their complex microlandscapes, require downscaling of global climate models to provide future...
Authors
David A. Helweg, Victoria W. Keener, Jeffrey Burgett
The Pacific Islands Climate Science Center five-year science agenda, 2014-2018
From the heights of Mauna Kea on Hawaiʻi Island to the depths of the Mariana Trench, from densely populated cities to sparse rural indigenous communities and uninhabited sandy atolls, the Pacific region encompasses diverse associations of peoples and places that are directly affected by changes to the atmosphere, ocean, and land. The peoples of the Pacific are among the first to observe...
Authors
David Helweg, Sarah A.B. Nash, Dan A. Polhemus
Science and Products
Vegetation and Water Monitoring Datasets for selected locations in the Republic of the Marshall Islands from 2017-2022
The Republic of the Marshall Islands (RMI) is a sovereign Small Island State in the tropical central North Pacific Ocean. RMI is a nation of more than thirty atolls and islands, most of which are inhabited, dispersed across an exclusive economic zone (EEZ) over 2 million square kilometers. This data release contains raster datasets for vegetation and water monitoring including Normalized...
Monthly Satellite-Estimated Precipitation Reports for the Republic of the Marshall Islands (ver. 2.1, January 2025)
The Republic of the Marshall Islands (RMI) is a nation of more than thirty low-lying atolls and islands, most of which are inhabited, dispersed across an Exclusive Economic Zone (EEZ) over 770,000 square miles in the tropical central North Pacific Ocean. Monitoring environmental conditions for potential drought risk is challenging in such a dispersed Island nation, and current drought...
Satellite precipitation estimates for selected locations in the Republic of the Marshall Islands (ver. 3.0, January 2025)
The Republic of the Marshall Islands (RMI) is a sovereign Small Island State in the tropical central North Pacific Ocean. RMI is a nation of more than thirty atolls and islands, most of which are inhabited, dispersed across an exclusive economic zone (EEZ) over 2 million square kilometers. This data release contains files of daily precipitation estimates beginning in 2001 for 23...
Developing version 2 of satellite-estimated precipitation monthly reports for selected locations in the Republic of the Marshall Islands
The Republic of the Marshall Islands (RMI; also known as the Marshall Islands) is a nation of more than 30 low-lying atolls and islands, most of which are inhabited, dispersed across an Exclusive Economic Zone over 770,000 square miles in the tropical central north Pacific Ocean. The study objectives and methods were originally presented in U.S. Geological Survey Data Report 1181 and are...
Authors
Gabriel B. Senay, David A. Helweg, Stefanie Bohms, Thomas Cecere, Tiare Eastmond, Amy Koch, Kurtis Nelson, Jack Randon
Developing satellite-estimated precipitation monthly reports for selected locations in the Republic of the Marshall Islands
The Republic of the Marshall Islands (also known as the Marshall Islands) is a nation of more than 30 low-lying atolls and islands, most of which are inhabited, dispersed across an Exclusive Economic Zone over 770,000 square miles in the tropical central north Pacific Ocean. Monitoring environmental conditions for potential drought risk is challenging in such a dispersed island nation...
Authors
Gabriel B. Senay, David A. Helweg, Stefanie Bohms, John W. Taylor, Thomas Cecere, Tiare Eastmond, Amy Koch, Kurtis Nelson, Lajikit Rufus
A century of drought in Hawai‘i: Geospatial analysis and synthesis across hydrological, ecological, and socioeconomic scales
Drought is a prominent feature of Hawaiʻi’s climate. However, it has been over 30 years since the last comprehensive meteorological drought analysis, and recent drying trends have emphasized the need to better understand drought dynamics and multi-sector effects in Hawaiʻi. Here, we provide a comprehensive synthesis of past drought effects in Hawaiʻi that we integrate with geospatial...
Authors
Abby G. Frazier, Christian P. Giardina, Thomas Giambelluca, Laura Brewington, Yi-Leng Chen, Pao-Shin Chu, Lucas Fortini, David Helweg, Victoria W. Keener, Ryan J. Longman, Matthew P Lucas, Alan Mair, Delwyn S. Oki, Julian J Reyes, Stephanie G. Yelenik, Clay Trauernicht
Managing effects of drought in Hawai’i and U.S.-affiliated Pacific Islands
How is drought expressed in Hawai‘i & USAPI? Drought is a significant climate feature in Hawai‘i and the U.S.-Affiliated Pacific Islands (USAPI), at times causing severe impacts across multiple sectors. Below average precipitation anomalies are often accompanied by higher than average temperatures and reduced cloud cover. The resulting higher insolation and evapotranspiration can magnify...
Authors
Abby G. Frazier, Jonathan Deenik, Neal Fujii, Greg Funderburk, Thomas Giambelluca, Christian P. Giardina, David A. Helweg, Victoria W. Keener, Donald Mair, John J. Marra, Sierra McDaniel, Lenore Ohye, Delwyn S. Oki, Elliott W.R. Parsons, Ayron Strauch, Clay Trauernicht
Hawai‘i and U.S.-Affiliated Pacific Islands
The U.S. Pacific Islands are culturally and environmentally diverse, treasured by the 1.9 million people who call them home. Pacific islands are particularly vulnerable to climate change impacts due to their exposure and isolation, small size, low elevation (in the case of atolls), and concentration of infrastructure and economy along the coasts.A prevalent cause of year-to-year changes...
Authors
Victoria W. Keener, David Helweg, Susan Asam, Seema Balwani, Maxine Burkett, Charles Fletcher, Thomas Giambelluca, Zena Grecni, Malia Nobrega-Olivera, Jeffrey Polovina, Gordon Tribble
Report from the workshop on climate downscaling and its application in high Hawaiian Islands, September 16–17, 2015
In the subtropical and tropical Pacific islands, changing climate is predicted to influence precipitation and freshwater availability, and thus is predicted to impact ecosystems goods and services available to ecosystems and human communities. The small size of high Hawaiian Islands, plus their complex microlandscapes, require downscaling of global climate models to provide future...
Authors
David A. Helweg, Victoria W. Keener, Jeffrey Burgett
The Pacific Islands Climate Science Center five-year science agenda, 2014-2018
From the heights of Mauna Kea on Hawaiʻi Island to the depths of the Mariana Trench, from densely populated cities to sparse rural indigenous communities and uninhabited sandy atolls, the Pacific region encompasses diverse associations of peoples and places that are directly affected by changes to the atmosphere, ocean, and land. The peoples of the Pacific are among the first to observe...
Authors
David Helweg, Sarah A.B. Nash, Dan A. Polhemus