Dataset associated with "Temporal Variations of NDVI and LAI and Interactions with Hydroclimatic Variables in a Large and Agro-Ecologically Diverse Region"

Ukasha, Muhammad; Ramirez, Jorge A.; Niemann, Jeffrey D.

Dataset associated with "Temporal Variations of NDVI and LAI and Interactions with Hydroclimatic Variables in a Large and Agro-Ecologically Diverse Region"

dc.contributor.author	Ukasha, Muhammad
dc.contributor.author	Ramirez, Jorge A.
dc.contributor.author	Niemann, Jeffrey D.
dc.coverage.spatial	Sacramento and San Joaquin River Basins, California	en_US
dc.coverage.temporal	2002-10-2015-09	en_US
dc.date.accessioned	2021-08-25T22:07:08Z
dc.date.available	2021-08-25T22:07:08Z
dc.date.issued	2021
dc.description	It contains the dataset used to produce Figure 2 in the manuscript and to estimate relationships of hydroclimatic variables with vegetation indices. Each variable is a monthly regional average (for combined Sacramento and San Joaquin river basins, California) and spans from October 2002 to September 2015. These regional averages have been estimated using different datasets which are cited in the manuscript. Description of dataset is as follows: 1. Dataset 1: Regional averages of monthly hydroclimatic and vegetation anomalies; 2. Dataset 2: Mean and standard deviations of monthly hydroclimatic and vegetation anomalies; 3. Dataset 3: Prewhitened time series of monthly hydroclimatic and vegetation anomalies; 4. Dataset 4: Prewhitened-detrended time series monthly hydroclimatic and vegetation anomalies; 5. Dataset 5: Annual time series of regional hydroclimatic and vegetation anomalies. See supplementary information provided with the manuscript for more information.	en_US
dc.description	Department of Civil and Environmental Engineering
dc.description.abstract	Satellite based vegetation indices are increasingly used to characterize seasonal and interannual variations in vegetation as well as vegetation’s response to hydroclimatic variability. However, differences in the behavior of vegetation indices are not well understood over large spatial extents (e.g., 0.5° or larger). We hypothesize that normalized difference vegetation index (NDVI) and leaf area index (LAI) can exhibit different behaviors due to different relationships with hydroclimatic variables. To test this hypothesis, observations of monthly precipitation, discharge, temperature, vapor pressure deficit, evapotranspiration, and total water storage anomalies (TWSA) are processed for the combined Sacramento and San Joaquin river basins in California for 13 water years (October 2002-September 2015). Estimates of NDVI and LAI are obtained for the same period from MODerate resolution Imaging Spectroradiometer (MODIS). The seasonal cycle of NDVI peaks 2-3 months earlier than LAI. The seasonal variation in NDVI follows the seasonality of TWSA (i.e. water availability) whereas the seasonal cycle of LAI follows the seasonality in mean temperature and vapor pressure deficit (i.e. atmospheric water demand). Cross-correlation analyses of NDVI and LAI with the hydroclimatic variables show that LAI is more strongly correlated with most of the hydroclimatic variables considered.	en_US
dc.description.sponsorship	This work was supported by a grant provided by Bureau of Educational and Cultural Affairs, US Department of State under the umbrella of foreign Fulbright scholarship program.	en_US
dc.format.medium	CSV
dc.identifier.uri	https://hdl.handle.net/10217/233661
dc.identifier.uri	http://dx.doi.org/10.25675/10217/233661
dc.language	English	en_US
dc.language.iso	eng	en_US
dc.publisher	Colorado State University. Libraries	en_US
dc.relation.ispartof	Research Data
dc.relation.isreferencedby	Ukasha, M., Ramirez, J. A., & Niemann, J. D. (2022). Temporal variations of NDVI and LAI and interactions with hydroclimatic variables in a large and agro-ecologically diverse region. Journal of Geophysical Research: Biogeosciences, 127, e2021JG006395. https://doi.org/10.1029/2021JG006395
dc.rights.license	The material is open access and distributed under the terms and conditions of the Creative Commons Public Domain "No rights reserved" (https://creativecommons.org/share-your-work/public-domain/cc0/).
dc.rights.uri	https://creativecommons.org/share-your-work/public-domain/cc0/
dc.title	Dataset associated with "Temporal Variations of NDVI and LAI and Interactions with Hydroclimatic Variables in a Large and Agro-Ecologically Diverse Region"	en_US
dc.type	Dataset	en_US