PO.DAAC is pleased to announce the release of the NASA MEaSUREs Integrated Multi-Mission Ocean Altimeter Data for Climate Research version 2 (v2) sea surface height anomaly dataset. It is comprised of TOPEX/Poseidon (T/P), Jason-1, and OSTM/Jason-2 (TPJAOS) altimeter data integrated to form a single Sea Surface Height (SSH) Climate Data Record (CDR) and merged into a single mean reference orbit.
Since the last quarterly release of TPJAOS v1, which spanned through cycle 144 of Jason-2, a number of algorithm revisions/improvements have been made and are included in the v2 release, which extends to the most current Jason-2 repeat cycle. Most notable was the release of the Jason-2 version D Geophysical Data Record (GDR_D) replacing the initial version T (GDR_T) heritage, and advances in the Precise Orbit Determination (POD) that provide improved realizations of the Time Variable Gravity (TVG) in addition to the common geodetic reference frame (ITRF2008) for all three missions. Documentation providing details of the v2 revisions are available at ftp://podaac.jpl.nasa.gov/allData/merged_alt/preview/L2/docs
Altimeter data from the multi-mission GDRs are interpolated to a common reference orbit facilitating direct time series analysis of the geo-referenced SSH. The baseline v2 file is comprised of 748 10-day repeat cycles spanning from September 1992 to December 2012. As future OSTM cycles become available and are fully validated the direct access structure of the file allows new data to be appended. All inter-mission biases have been applied to provide a seamless transition throughout the current 20+ year record.
Each SSH data record is a SSH time series at a specific geo-referenced
location defined by revolution number and along-track index. A
3-dimensional directory (rev#, index, cycle) permits direct access of
individual locations at specific times (i.e. temporal and spatial
sub-sampling). Auxiliary files provide time, mean sea surface reference,
terrain type, bathymetry, proximity to coast, and SSH quality assessments
(flag word) at each geo-referenced location.
The data are available in NetCDF format by individual cycles or the
entire time series in a single file.
The entire time series file is located at:
Dataset Information Page:
http://podaac.jpl.nasa.gov/dataset/MERGED_TP_J1_OSTM_OST_ALL_V2
Data Access (FTP):
ftp://podaac-ftp.jpl.nasa.gov/allData/merged_alt/preview/L2/TP_J1_OSTM/all
Data Access (OPeNDAP):
http://opendap.jpl.nasa.gov/opendap/SeaSurfaceTopography/merged_alt/preview/L2/TP_J1_OSTM/all/contents.html
The individual cycles are located at:
Dataset Information Page:
http://podaac.jpl.nasa.gov/dataset/MERGED_TP_J1_OSTM_OST_CYCLES_V2
Data Access (FTP):
ftp://podaac-ftp.jpl.nasa.gov/allData/merged_alt/preview/L2/TP_J1_OSTM/cycles
Data Access (OPeNDAP):
http://opendap.jpl.nasa.gov/opendap/SeaSurfaceTopography/merged_alt/preview/L2/TP_J1_OSTM/cycles/contents.html
The Global Mean Sea Level produced from these data are located at:
Dataset Information Page:
http://podaac.jpl.nasa.gov/dataset/MERGED_TP_J1_OSTM_OST_GMSL_ASCII_V2
Data Access (FTP):
ftp://podaac.jpl.nasa.gov/allData/merged_alt/preview/global_mean_sea_level/GMSL_TPJAOS_199209_201301.txt
Documentation can be found at:
ftp://podaac.jpl.nasa.gov/allData/merged_alt/preview/L2/docs
Read software can be found at:
ftp://podaac.jpl.nasa.gov/allData/merged_alt/preview/L2/sw