Effective Hydrological Angular Momentum Functions (HAM) File name : ESMGFZ_HAM_v1.2_24h_2025.asc File contents : effective angular momentum functions from hydrological (land) mass and motion terms File units : dimensionless earth rotation excitation functions Issue date : 2025-02-05 Version number : v1.2 References : Dobslaw, H., R. Dill, A. Groetzsch, A. Brzezinski, and M. Thomas (2010), Seasonal polar motion excitation from numerical models of atmosphere, ocean, and continental hydrosphere, J. Geophys. Res., doi:10.1029/2009JB007127 Contact : Henryk Dobslaw, dobslaw@gfz-potsdam.de Affiliation : Deutsches GeoForschungsZentrum GFZ Dep. 1: Geodesy and Remote Sensing Sec. 1.3: Earth System Modelling Telegrafenberg 14473 Potsdam, Germany Temporal domain : 01.01.2025 through 04.02.2025 (12:00 UTC) Temporal resolution : 24h Number of data records : 35 Subtracted mean value : mean from 2003-01-01 to 2014-12-31 (only x-, y-, z-component mass terms) -1.722266235718563e-07 1.442803309340720e-06 2.052039186123164e-08 Hydrological model : Land Surface Discharge Model (LSDM) Horizontal domain : global, continental land surface Horizontal resolution : 0.5 x 0.5 degree (regular grid) Vertical resolution : 1 surface layer Hydrologic model forcing : Precipitation : daily sum from 3h ECMWF operational model (short-term forecasts) Evaporation : daily sum from 3h ECMWF operational model (short-term forecasts) Temperature : daily average from 6h ECMWF operational model (analyses) Data assimilated : None Notes : These HAMs are part of a set of consistently processed Earth rotation excitation function (AAM, OAM, HAM). The ocean model MPIOM and the hydrological model LSDM were forced consistently with operational analysis data from the ECMWF. Further references to be mentioned, when LSDM data are used: Dill, R., Hydrological model LSDM for operational Earth rotation and gravity field variations. GFZ Scientific Technical Report STR08/09, 2008 ------------------------------------------------------------------------------------------------------------------------------------------------------ YYYY MM DD HH MJD HAM mass term HAM motion term x-component y-component z-component x-component y-component z-component 2025 01 01 12 60676.500 -1.537208438842897e-07 1.488894812960800e-07 -2.525429442458419e-10 -1.758047193766010e-11 -1.179560224303550e-11 1.987868586346470e-13 2025 01 02 12 60677.500 -1.545073435928217e-07 1.487862884876299e-07 -2.333069712734415e-10 -1.773841144257140e-11 -1.204350517052940e-11 2.019853872812620e-13 2025 01 03 12 60678.500 -1.539282274015537e-07 1.497749829396900e-07 -2.165199494369410e-10 -1.797013105625270e-11 -1.234421998714020e-11 2.054120345953980e-13 2025 01 04 12 60679.500 -1.529035507690827e-07 1.494270266336700e-07 -1.949923374033424e-10 -1.823374648678930e-11 -1.265667217566240e-11 2.090583204697960e-13 2025 01 05 12 60680.500 -1.528195889069167e-07 1.515549195156900e-07 -1.573862209665404e-10 -1.850002686373720e-11 -1.298092030928700e-11 2.129525407263710e-13 2025 01 06 12 60681.500 -1.520485376938817e-07 1.523080948940798e-07 -1.328319456464430e-10 -1.881888362511840e-11 -1.332159532377400e-11 2.167752106971810e-13 2025 01 07 12 60682.500 -1.509870393858867e-07 1.512447077544300e-07 -1.223542926130404e-10 -1.918446278498050e-11 -1.372561763411160e-11 2.206633679698860e-13 2025 01 08 12 60683.500 -1.502416289014897e-07 1.490823937385900e-07 -1.025268863099399e-10 -1.961679143196680e-11 -1.415062021790110e-11 2.247318245614070e-13 2025 01 09 12 60684.500 -1.489337806147297e-07 1.491108763809800e-07 -8.107106334744213e-11 -2.009581299965990e-11 -1.465731617908470e-11 2.288078813389360e-13 2025 01 10 12 60685.500 -1.481092892822687e-07 1.511307300430799e-07 -6.110122156624186e-11 -2.060586318204770e-11 -1.521739659988940e-11 2.328831556465490e-13 2025 01 11 12 60686.500 -1.469623741009827e-07 1.510978075601100e-07 -4.625675087594208e-11 -2.114404514778580e-11 -1.574375988051520e-11 2.369399509944840e-13 2025 01 12 12 60687.500 -1.455204346434647e-07 1.494937693381499e-07 -2.799674360904057e-11 -2.178391553909380e-11 -1.626122899178040e-11 2.409733468166380e-13 2025 01 13 12 60688.500 -1.428804306654927e-07 1.487832269714700e-07 -6.736096693406627e-13 -2.237330734759770e-11 -1.680994439405400e-11 2.451450535513160e-13 2025 01 14 12 60689.500 -1.402726410580817e-07 1.476475021673199e-07 2.811179272985787e-11 -2.297558078089720e-11 -1.739597116716090e-11 2.491664729763880e-13 2025 01 15 12 60690.500 -1.396886138028937e-07 1.464644215071500e-07 3.862573326335708e-11 -2.354605985182460e-11 -1.797716142398420e-11 2.533375400719230e-13 2025 01 16 12 60691.500 -1.386736481451477e-07 1.461876806959100e-07 4.513036360675953e-11 -2.415152132471960e-11 -1.856431580633850e-11 2.574259964686870e-13 2025 01 17 12 60692.500 -1.386245537587137e-07 1.466188648899399e-07 5.547537106745771e-11 -2.476215830841400e-11 -1.911787292399830e-11 2.614044851181320e-13 2025 01 18 12 60693.500 -1.394263954053787e-07 1.468960124641700e-07 6.249381192835743e-11 -2.544270567284150e-11 -1.968335604660790e-11 2.653698423224410e-13 2025 01 19 12 60694.500 -1.389498766442817e-07 1.468447066584099e-07 7.309369465715951e-11 -2.618219100844130e-11 -2.026762660870810e-11 2.689237388475960e-13 2025 01 20 12 60695.500 -1.376074168965517e-07 1.456943316430600e-07 9.130202237285753e-11 -2.696205308151120e-11 -2.086532061269630e-11 2.721901379471210e-13 2025 01 21 12 60696.500 -1.367739234057387e-07 1.460291964658800e-07 9.972742473225697e-11 -2.776322140841880e-11 -2.147426199654910e-11 2.755009195171660e-13 2025 01 22 12 60697.500 -1.362648375636917e-07 1.464872563523298e-07 1.170260277822591e-10 -2.862061768262510e-11 -2.211781619197170e-11 2.788169659748210e-13 2025 01 23 12 60698.500 -1.353990382393427e-07 1.465555276588198e-07 1.289873396992579e-10 -2.949777107928970e-11 -2.279791132429990e-11 2.821421784856250e-13 2025 01 24 12 60699.500 -1.343266189329807e-07 1.460846633827500e-07 1.476356662127594e-10 -3.035490215261870e-11 -2.353814270504570e-11 2.858685482484620e-13 2025 01 25 12 60700.500 -1.337791965402727e-07 1.466854548468000e-07 1.660188037869576e-10 -3.108712098945980e-11 -2.430186560115760e-11 2.896039097872020e-13 2025 01 26 12 60701.500 -1.333785067086687e-07 1.473029624762799e-07 1.754831373446570e-10 -3.180129718886890e-11 -2.498578120198110e-11 2.931013644923080e-13 2025 01 27 12 60702.500 -1.334457161562037e-07 1.481096398905000e-07 1.816130863918585e-10 -3.238913495575920e-11 -2.561793366825510e-11 2.965128337443420e-13 2025 01 28 12 60703.500 -1.335182144711077e-07 1.476597815481000e-07 1.907153347195580e-10 -3.293621350044530e-11 -2.617952634323460e-11 3.000334615558010e-13 2025 01 29 12 60704.500 -1.333868553547857e-07 1.477334725112100e-07 2.077792157396589e-10 -3.346918293382130e-11 -2.671918282841520e-11 3.036797925604780e-13 2025 01 30 12 60705.500 -1.333079635373047e-07 1.483278914248899e-07 2.289073660963600e-10 -3.404069738707030e-11 -2.727611809339430e-11 3.073097565320340e-13 2025 01 31 12 60706.500 -1.324490329902817e-07 1.503350414870899e-07 2.515869751042577e-10 -3.459846696544180e-11 -2.795446233064910e-11 3.110250590765980e-13 2025 02 01 12 60707.500 -1.320206632080247e-07 1.506693266805899e-07 2.634364559774600e-10 -3.515880239446030e-11 -2.864453942421050e-11 3.148058802467320e-13 2025 02 02 12 60708.500 -1.306626763560307e-07 1.509155784280499e-07 2.757853213781600e-10 -3.582314176153540e-11 -2.940613546007100e-11 3.185216816163280e-13 2025 02 03 12 60709.500 -1.303385207796457e-07 1.526173169582299e-07 2.907324767103575e-10 -3.654958727743940e-11 -3.018724379075730e-11 3.220941328386240e-13 2025 02 04 12 60710.500 -1.304992949208977e-07 1.546688740743698e-07 3.079597746057593e-10 -3.722396092460810e-11 -3.092912301743400e-11 3.255386508418950e-13