Data Set Citation:
When using this data, please cite the data package:
NCEAS 5920: Pyke: Understanding environmental variability in human-dominated landscape , National Center for Ecological Analysis and Synthesis , and Pyke C.
Vernal Pool Hydroregime Surfaces for the Central Valley of California
bowdish.271.3 (https://knb.ecoinformatics.org:443/knb/metacat/bowdish.271.3/nceas)
General Information:
Title:Vernal Pool Hydroregime Surfaces for the Central Valley of California
Identifier:bowdish.271
Abstract:
Vernal pools are ephemeral wetlands formed in small, topographic depressions throughout the Central Valley of California. Ecological processes in these wetlands are dominated by their hydrologic conditions, collectively described as their hydrologic regime. This includes the timing and duration of flooding and patterns of inter-annual variability (e.g., fraction of years with flooding suitable for reproduction of a certain species of concern). This dataset provides a preliminary look at geographic patterns in seven important hydroregime variables.
Keywords:
  • Vernal Pool
  • Surface Water
  • Wetlands
  • Inundation
  • Central Valley of California
  • Hydropattern
Data Table, Image, and Other Data Details:
Metadata download: Ecological Metadata Language (EML) File
Data Table:Avg. longest continuous flood ( View Metadata | Download File download)
Data Table:Fraction of years with less than 45 day ( View Metadata | Download File download)
Data Table:Fraction of years with flooding less than30 days ( View Metadata | Download File download)
Data Table:Average max. daily temp (C) ( View Metadata | Download File download)
Data Table:Avg. longest continuous flood, Holland Pools Only ( View Metadata | Download File download)
Data Table:Fraction of years less than 45 days continuous flooding, Holland pools only ( View Metadata | Download File download)
Data Table:Fraction of years with flooding less than 30 days, Holland pools only ( View Metadata | Download File download)
Data Table:Average max. daily temp (C), Holland pools only ( View Metadata | Download File download)
Data Table:Daily minimum water temperature, Holland pools only ( View Metadata | Download File download)
Data Table:Daily minimum water temperature ( View Metadata | Download File download)

Involved Parties

Data Set Creators:
Organization:NCEAS 5920: Pyke: Understanding environmental variability in human-dominated landscape
Organization:National Center for Ecological Analysis and Synthesis
Individual: Chris Pyke
Email Address:
pyke.chris@epa.gov
Data Set Contacts:
Individual: Chris Pyke
Email Address:
pyke.chris@epa.gov

Data Set Characteristics

Geographic Region:
Geographic Description:Central Valley of California
Bounding Coordinates:
West:  -122.506  degrees
East:  -119.25  degrees
North:  40.303  degrees
South:  34.844  degrees

Sampling, Processing and Quality Control Methods

Step by Step Procedures
Step 1:  
Description:
Methods used

Introduction and Limits of Use

The surfaces were generated in a three step process: (1) estimation of hydroregime variables for 34 point locations (weather stations) across the Central Valley using the PHYDO hydroregime model, (2) fitting regression models to these stations, (3) applying the regression models to capture large-scale trends, (4) estimating residuals for each station, (5) interpolating residuals across the Valley to capture fine-scale variation and restore exact modeled values at each station, and (6) add the regression models and the interpolated residuals to create final raster surfaces (see Pyke (2002) for a detailed discussion of methods). In some cases these surfaces were cleaned with conditional operators to pick off outlying values that sometimes occur along the edges of the Valley. The most typical operation removed flood durations greater than 365 or less than 0 and replaced them with 0 values. These filters were not applied at all to the"pools-only" surfaces.

Instrument(s): The development of the PHYDO model balanced detailed descriptions of individual pools against a desire to understand populations of pools in different landscapes. PHYDO primarily seeks to describe the aggregate behavior of populations of pools under given climate regime. PHYDO's secondary application is to simulate the dynamics of any specific pool. For local applications,PHYDO is best used in tandem with observational data to validate and, if necessary, adjust the model to specific conditions. The raster data available in these files is best used for relative comparisons between sites (i.e., this site is wetter or drier than another site) and assessments at the ecoregional scale.
Sampling Area And Frequency:
34 point locations (weather stations) across the Central Valley using the PHYDO hydroregime model
Sampling Description:
The raster data available in these files is best used for relative comparisons between sites (i.e., this site is wetter or drier than another site) and assessments at the ecoregional scale. The surfaces available in this distribution reflect only the average hydroregime responses for 100 pools in each location, and although the distribution around each average (i.e., the range of conditions modeled for the entire set of 100 pools) is known, this data is not included with these data surfaces at this time.

Data Set Usage Rights

Access Control:
Auth System:knb
Order:denyFirst
Metadata download: Ecological Metadata Language (EML) File