GRACE Technical Note 13 TITLE: Monthly estimates of degree-1 (geocenter) gravity coefficients, generated from GRACE (04-2002 - 06/2017) and GRACE-FO (06/2018 onward) RL0601 solutions. Last reported data point: 16-May-2023. UPDATE HISTORY: Created/updated 14-Jul-2023 17:08:35. AUTHOR: Felix Landerer, Jet Propulsion Laboratory (JPL) Contact: grace@jpl.nasa.gov REFERENCES: Sun, Y., R. Riva, and P. Ditmar (2016), Optimizing estimates of annual variations and trends in geocenter motion and J2 from a combination of GRACE data and geophysical models, J. Geophys. Res. Solid Earth, 121, doi:10.1002/2016JB013073. Swenson, S., D. Chambers, and J. Wahr 2008 Estimating geocenter variations from a combination of GRACE and ocean model output, J. Geophys. Res., 113, B08410, doi:10.1029/2007JB005338. DESCRIPTION: This file contains estimates of degree-1 gravity coefficients for the GRACE Release-06 data, based on ocean and atmospheric models and GRACE coefficients for degrees 2 and higher. The original method was developed by [Swenson et al., 2008], and subsequently expanded by [Sun et al., 2016] to include the effects of the barystatic sea level fingerprint (i.e., solving the sea level equation using land mass changes as measured by GRACE) in the ocean mass contribution to degree-1. The implementation for degree-1 coefficients below uses the optimal parameter values as described in [Sun et al., 2016]. These coefficients represent the degree 1 gravity coefficients that should be added to the GSM coefficients to correct for geocenter motion, relative to the modeled atmosphere and ocean degree 1 coefficients (e.g., GAC and GAD). The coefficients have been normalized using the GRACE standards. Prior to the inversion for degree-1, GRACE-C20 has been replaced with the SLR-C20 (TN-14), and GIA has been corrected with ICE6G-D. To use for land applications or to compute global ocean mass, use these coefficients along with GRACE GSM coefficients for degrees 2 and higher, along with a Degree 1 Love number (k1) = 0.021. For ocean applications, add the degree 1 values found in the ocean bottom pressure product (GAD) to these values. If you are interested in the full ocean, land, atmosphere geocenter, add the degree 1 values of the atmosphere/ocean product (GAC) to these values. SPECIAL NOTES: 1) Reported values are derived from geopotential anomalies relative to GGM05C (epoch: 2008-01-01) NOTE: A previous version from 04/2019 had an inconsistent epoch removed - please update all data with the most recent version 2) The 1-sigma errors are based on Tab.1 of [Sun et al., 2016] 3) The native GRACE C20 coefficient has been replaced with SLR-C20 (TN-14) 4) GIA has been corrected for subtracting the ICE6G-D (Peltier et al., 2018) prior to the degree-1 inversion 5) From 06/2019 on, C30 in GRACE-FO has been replaced with SLR-C30 (TN-14) FORMAT: The data format is similar to that for GSM, GAD, and GAC files distributed by PODAAC, see GRACE Level-2 handbook for more information. # EGM Coefficient Record 2 variables: record_key: key_name : GRCOF2 long_name : Earth Gravity Spherical Harmonic Model Format Type coverage_content_type : referenceInformation data_type : string comment : 1st column degree_index: long_name : spherical harmonic degree l coverage_content_type : referenceInformation data_type : int32 comment : 2nd column order_index: long_name : spherical harmonic order m coverage_content_type : referenceInformation data_type : int32 comment : 3rd column clm: long_name : Clm coefficient; cosine coefficient for degree l and order m data_type : double precision comment : 4th column slm: long_name : Slm coefficient; sine coefficient for degree l and order m data_type : double precision comment : 5th column clm_std_dev: long_name : standard deviation of Clm coverage_content_type : qualityInformation data_type : double precision comment : 6th column; slm_std_dev: long_name : standard deviation of Slm coverage_content_type : qualityInformation data_type : double precision comment : 7th column; epoch_begin_time: long_name : epoch begin of Clm, Slm coefficients time_format : yyyymmdd.hhmm coverage_content_type : referenceInformation data_type : string comment : 8th column epoch_stop_time: long_name : epoch stop of Clm, Slm coefficients time_format : yyyymmdd.hhmm coverage_content_type : referenceInformation data_type : string comment : 9th column solution_flags: long_name : Comment when present coverage_content_type : referenceInformation data_type : string comment : 10th column end of header =============================================================================== GRCOF2 1 0 +5.217938630e-10 +0.000000000e+00 +4.4585e-11 +0.0000e+00 20020405.0000 20020501.0000 GRCOF2 1 1 +2.867772767e-10 -6.807046289e-11 +4.5296e-11 +5.0724e-11 20020405.0000 20020501.0000 GRCOF2 1 0 +4.698508640e-10 +0.000000000e+00 +4.4585e-11 +0.0000e+00 20020503.0000 20020518.0000 GRCOF2 1 1 +1.536697991e-10 -8.908966214e-11 +4.5296e-11 +5.0724e-11 20020503.0000 20020518.0000 GRCOF2 1 0 +4.107888082e-13 +0.000000000e+00 +4.4585e-11 +0.0000e+00 20020801.0000 20020901.0000 GRCOF2 1 1 -1.634669600e-11 +4.805958658e-11 +4.5296e-11 +5.0724e-11 20020801.0000 20020901.0000 GRCOF2 1 0 -8.342397321e-11 +0.000000000e+00 +4.4585e-11 +0.0000e+00 20020901.0000 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