Pacific Region RCSD Projects & Activities (PAWS) Worksheet
Form used for a entering PAWS into Piko (Worsheet Version April 27 2012)
Acronym
Name/Title
Trends and Shifts in Streamflow in Hawaii, 1913-2008
Capability Area: Understanding Climate Variability and Change
Understanding Climate Variability and Change
Observing Systems, Data Stewardship, Data Services
Operational Products and Services
Research/Development
Historical Observations (hindcasts/climatologies)
Projections (modeling and downscaling)
Training and Capacity Building, Education, Outreach
Best Practices/Guidance
Decision Support Tools
Essential Climate Variable/Parameter
Atmospheric:
Surface (e.g., temp, precip, wind)
Upper-Air
Composition
Oceanic:
Surface (e.g., SST, SSH, salinity, ocean color)
Sub-surface (e.g., temp, salinity, nutrients, carbon, phytoplankton)
Terrestrial:
(e.g., surface water, glaciers and ice caps, land cover, biomass)
Time Frame
Seasonal (outlook)
Intra-annual to Decadal
Multi-decadal (scenarios)
Capability Area: Understanding Climate Impacts and Informing Adaptation
Understanding Climate Impacts and Informing Adaptation
Climate Impacts
Observing Systems, Data Stewardship, Data Services
Research/Development
Historical Observations (hindcasts/climatologies)
Projections (modeling and downscaling)
Climate Adaptation
Training and Capacity Building, Education, Outreach
Best Practices/Guidance
Decision Support Tools
Policies and Legislation
Assessment and Evaluation
Sector
Public Health and Safety
Fresh Water Resources
Energy
Transportation/Communication and Commerce
Community Planning and Development
Social and Cultural Resources
Agriculture and Fisheries
Recreation and Tourism
Ecosystems
Other
Status
Completed
Ongoing
Planned
Proposed
Focus Area
Fresh Water Resources and Drought
Coastal Inundation/Sea Level Rise, Extreme Weather, and Community Resilience
Marine and Terrestrial Ecosystems
Region/Locale
Central North Pacific
State of Hawaii
Northwestern Hawaiian Islands
Pacific Remote Islands
Western North Pacific
Commonwealth of the Northern Mariana Islands (CNMI)
Federated States of Micronesia (FSM)
Guam
Republic of Palau
Republic of Marshall Islands (RMI)
Other Western North Pacific
South Pacific
American Samoa
Australia
Cook Islands
Fiji
French Polynesia
Kiribati
New Zealand
Papua New Guinea (PNG)
Samoa
Solomon Islands
Tonga
Tuvalu
Vanuatu
Other South Pacific
Pacific Basin
Global
Description
This study addresses a need to document changes in streamflow and base flow in Hawaii during the past century. Hydrological Processes, 27: 1484 - 1500.
Objectives/Outcomes
Statistically significant long-term (1913-2008) downward trends were detected (using the nonparametric Mann-Kendall test) in low-streamflow and base-flow records. These long-term downward trends are likely related to a statistically significant downward shift around 1943 detected (using the nonparametric Pettitt test) in index records of streamflow and base flow. The downward shift corresponds to a decrease of 22% in median streamflow and a decrease of 23% in median base flow between the periods 1913-1943 and 1943-2008. The shift coincides with other local and regional factors, including a change from a positive to a negative phase in the Pacific Decadal Oscillation, shifts in the direction of the trade winds over Hawai'i, and a reforestation programme. The detected shift and long-term trends reflect region-wide changes in climatic and land-cover factors. A weak pattern of downward trends in base flows during the period 1943-2008 may indicate a continued decrease in base flows after the 1943 shift. Downward trends were detected more commonly in base-flow records than in high-streamflow, peak-flow, and rainfall records. The decrease in base flow is likely related to a decrease in groundwater storage and recharge and therefore is a valuable indicator of decreasing water availability and watershed vulnerability to hydrologic changes. Whether the downward trends will continue is largely uncertain given the uncertainty in climate-change projections and watershed responses to changes.
Lead Agencies, Institutions and Organizations
USGS/PIWSC
Contacts(names, emails)
Maoya Bassiouni, mbassiou@usgs.gov Delwyn Oki, dsoki@usgs.gov
Partnering Agencies, Institutions, and Organizations
PICCC
Required Resources
Projected Timelines
Feedback Mechanisms and Evaluation Measures
Url
http://pubs.er.usgs.gov/publication/70040116
Worksheet
PnA_SFTHI.doc
Keywords
Understanding Climate Variability and Change Historical Observations (hindcasts/climatologies) (e.g., surface water, glaciers and ice caps, land cover, biomass) Ongoing Fresh Water Resources and Drought Central North Pacific State of Hawaii Intra-annual to Decadal Completed Understanding Climate Impacts and Informing Adaptation Historical Observations (hindcasts/climatologies) Climate Impacts Fresh Water Resources Agriculture and Fisheries Recreation and Tourism Ecosystems