Effective Hydrological Angular Momentum Functions (HAM) File name : ESMGFZ_HAM_v1.2_24h_2026.asc File contents : effective angular momentum functions from hydrological (land) mass and motion terms File units : dimensionless earth rotation excitation functions Issue date : 2026-03-12 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 : 01.01.2026 through 11.03.2026 (12:00 UTC) Temporal resolution : 24h Number of data records : 70 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 2026 01 01 12 61041.500 -1.067646081584817e-07 1.219376581268898e-07 -1.347913828080408e-10 -3.665561005792780e-11 -2.636775929538270e-11 3.588940463975290e-13 2026 01 02 12 61042.500 -1.079082399426477e-07 1.231203154866499e-07 -1.343834587722409e-10 -3.724896757337540e-11 -2.674421564521460e-11 3.605486888094670e-13 2026 01 03 12 61043.500 -1.086803447969257e-07 1.250297645527898e-07 -1.286126768973398e-10 -3.783818667783170e-11 -2.720620177661710e-11 3.621420588966720e-13 2026 01 04 12 61044.500 -1.082034193193807e-07 1.265328171389298e-07 -1.045149846413414e-10 -3.852074246162880e-11 -2.776351352393870e-11 3.637863142090190e-13 2026 01 05 12 61045.500 -1.072786335332327e-07 1.274406158539599e-07 -8.826059915794094e-11 -3.920915338708940e-11 -2.833262928057970e-11 3.658947491415420e-13 2026 01 06 12 61046.500 -1.078105244071317e-07 1.284224918273099e-07 -9.006869274224108e-11 -3.991394130697090e-11 -2.891260070483210e-11 3.681530787937240e-13 2026 01 07 12 61047.500 -1.086979218156437e-07 1.296777348552000e-07 -9.452150779684218e-11 -4.069085483853320e-11 -2.949689510619550e-11 3.703223111683320e-13 2026 01 08 12 61048.500 -1.105228865557547e-07 1.301691624461898e-07 -7.024081222753995e-11 -4.142175148235080e-11 -3.007801398852930e-11 3.726083610457880e-13 2026 01 09 12 61049.500 -1.109090737063437e-07 1.315019433925198e-07 -4.366891879944191e-11 -4.211034739248340e-11 -3.063942944527950e-11 3.750254497093800e-13 2026 01 10 12 61050.500 -1.102879569038257e-07 1.343539438571400e-07 -1.455159320994216e-11 -4.285713998274560e-11 -3.124774656206040e-11 3.776074331642110e-13 2026 01 11 12 61051.500 -1.110887936057777e-07 1.369511457659499e-07 7.882725863257493e-12 -4.357347958733930e-11 -3.187191748468120e-11 3.803016513632650e-13 2026 01 12 12 61052.500 -1.106669211860957e-07 1.389963836177500e-07 2.526934041905902e-11 -4.433530316648660e-11 -3.251702893501860e-11 3.833082089055790e-13 2026 01 13 12 61053.500 -1.096877134021757e-07 1.389590414170100e-07 3.374261836776008e-11 -4.517690740248500e-11 -3.316537496846450e-11 3.862225015899490e-13 2026 01 14 12 61054.500 -1.095843137455527e-07 1.406623791770699e-07 4.280260788185902e-11 -4.597394300619820e-11 -3.379886102013600e-11 3.892292545394290e-13 2026 01 15 12 61055.500 -1.103340158983207e-07 1.427752044364199e-07 5.848415544715728e-11 -4.675250576027820e-11 -3.437763074975640e-11 3.925031532116310e-13 2026 01 16 12 61056.500 -1.090143585589997e-07 1.434137791108699e-07 7.509191154136011e-11 -4.759683942080520e-11 -3.494737596811900e-11 3.962941653019210e-13 2026 01 17 12 61057.500 -1.094487327715267e-07 1.455567632856899e-07 8.218133489705951e-11 -4.842789465636210e-11 -3.552559645283860e-11 4.005751168384760e-13 2026 01 18 12 61058.500 -1.099876875906937e-07 1.470990488619199e-07 8.145225400305978e-11 -4.918167695595140e-11 -3.609158800522580e-11 4.047639190924850e-13 2026 01 19 12 61059.500 -1.092282179292927e-07 1.466859504547100e-07 8.459143820675703e-11 -4.986777627375240e-11 -3.663851561151470e-11 4.088015223805400e-13 2026 01 20 12 61060.500 -1.088686682030517e-07 1.459357656972900e-07 9.985176541215735e-11 -5.058688603038480e-11 -3.723199035656660e-11 4.130918886340650e-13 2026 01 21 12 61061.500 -1.095869059349267e-07 1.451229605237998e-07 1.221093307542570e-10 -5.131608250049920e-11 -3.780880261876490e-11 4.171214974054690e-13 2026 01 22 12 61062.500 -1.109790729547577e-07 1.435584980863199e-07 1.301842624204595e-10 -5.212733604153280e-11 -3.840955817074230e-11 4.209867439143020e-13 2026 01 23 12 61063.500 -1.126597942356967e-07 1.429582537068799e-07 1.291338386412596e-10 -5.292511536613950e-11 -3.899049149506330e-11 4.250125622321980e-13 2026 01 24 12 61064.500 -1.133929985240347e-07 1.466124547255499e-07 1.458478232400574e-10 -5.379245337488050e-11 -3.963725425230930e-11 4.292070990459910e-13 2026 01 25 12 61065.500 -1.152781296215467e-07 1.508005850849199e-07 1.689467024608599e-10 -5.470660767288720e-11 -4.031779346069170e-11 4.333283843709550e-13 2026 01 26 12 61066.500 -1.182047271569587e-07 1.519488481182999e-07 1.868436304283584e-10 -5.563092133961070e-11 -4.099138747391770e-11 4.376175933122290e-13 2026 01 27 12 61067.500 -1.206466671962857e-07 1.511651562451800e-07 2.191429037880581e-10 -5.657096230868900e-11 -4.159285352596380e-11 4.417549121977430e-13 2026 01 28 12 61068.500 -1.224012951729007e-07 1.507141919179900e-07 2.409474596513574e-10 -5.746864109566020e-11 -4.223170631016200e-11 4.460361723144260e-13 2026 01 29 12 61069.500 -1.232328013773677e-07 1.496145952992598e-07 2.539061589603571e-10 -5.830328688856150e-11 -4.287962336626820e-11 4.508365040479800e-13 2026 01 30 12 61070.500 -1.231564731150557e-07 1.492748073894498e-07 2.665479524725577e-10 -5.907319677814720e-11 -4.352210398819610e-11 4.555812802963910e-13 2026 01 31 12 61071.500 -1.235892887322307e-07 1.506874722327100e-07 2.897412967739591e-10 -5.974785170673700e-11 -4.427792606997690e-11 4.602205051942770e-13 2026 02 01 12 61072.500 -1.238856992430717e-07 1.505852152923400e-07 3.101446021297590e-10 -6.050067058226800e-11 -4.503298055275470e-11 4.648617293691320e-13 2026 02 02 12 61073.500 -1.252174376744167e-07 1.505859852649299e-07 3.194622262939569e-10 -6.117880556076170e-11 -4.569070498289500e-11 4.694563155318180e-13 2026 02 03 12 61074.500 -1.269964290267827e-07 1.499265973007899e-07 3.262067342038592e-10 -6.185361294886580e-11 -4.630334606760470e-11 4.738999738464060e-13 2026 02 04 12 61075.500 -1.288363696584897e-07 1.505973056797699e-07 3.337273374840590e-10 -6.245324298737480e-11 -4.689449056341550e-11 4.780853878067170e-13 2026 02 05 12 61076.500 -1.315825415432167e-07 1.503296133942699e-07 3.535127455683571e-10 -6.309343154254290e-11 -4.744056717166310e-11 4.823213882733420e-13 2026 02 06 12 61077.500 -1.338621315512297e-07 1.503566586015098e-07 3.698128737506583e-10 -6.374593957100289e-11 -4.795880792572070e-11 4.868206238721660e-13 2026 02 07 12 61078.500 -1.358278765342577e-07 1.508189212759100e-07 4.006125896519576e-10 -6.432743126212260e-11 -4.850122289858820e-11 4.912687432714260e-13 2026 02 08 12 61079.500 -1.360475783696537e-07 1.518469719660900e-07 4.215813451069588e-10 -6.486545900436810e-11 -4.900929729641450e-11 4.955318403242680e-13 2026 02 09 12 61080.500 -1.359463395022377e-07 1.521692162799200e-07 4.379619212218577e-10 -6.532234992873089e-11 -4.942731193542200e-11 4.995368627340860e-13 2026 02 10 12 61081.500 -1.357365229944677e-07 1.510181408444299e-07 4.578350522732588e-10 -6.582860109959400e-11 -4.978393912420820e-11 5.032245760366680e-13 2026 02 11 12 61082.500 -1.374418108030237e-07 1.514601151653000e-07 4.695657533592598e-10 -6.627760596428020e-11 -5.018010456134350e-11 5.066965360489800e-13 2026 02 12 12 61083.500 -1.400220872199317e-07 1.508214784220999e-07 4.878781777294574e-10 -6.678695213423790e-11 -5.060750383280620e-11 5.100845747909160e-13 2026 02 13 12 61084.500 -1.424913857433577e-07 1.499300058974599e-07 5.251261487608597e-10 -6.725883310669210e-11 -5.097086663924530e-11 5.134485570422820e-13 2026 02 14 12 61085.500 -1.431944404792877e-07 1.509770954625100e-07 5.568349556101597e-10 -6.776463373900499e-11 -5.129284285630860e-11 5.170602364777740e-13 2026 02 15 12 61086.500 -1.452561366997227e-07 1.525223559642400e-07 5.879743917921582e-10 -6.819736584289250e-11 -5.162467004959870e-11 5.209238640213530e-13 2026 02 16 12 61087.500 -1.458627955443707e-07 1.525473274692199e-07 6.186732016809589e-10 -6.863118711956500e-11 -5.196009347760590e-11 5.247461636938120e-13 2026 02 17 12 61088.500 -1.459836250259277e-07 1.539675737754700e-07 6.456435774244579e-10 -6.910057918754860e-11 -5.227735726448870e-11 5.288023227292750e-13 2026 02 18 12 61089.500 -1.472475939665447e-07 1.564216754203999e-07 6.685174658429573e-10 -6.964552717065609e-11 -5.260332902509190e-11 5.327687818825000e-13 2026 02 19 12 61090.500 -1.484143293918047e-07 1.565372955754600e-07 6.852447421225575e-10 -7.007633860691150e-11 -5.294241319054470e-11 5.369473259697460e-13 2026 02 20 12 61091.500 -1.488297124270487e-07 1.584097530786199e-07 7.024242591597571e-10 -7.051559929252339e-11 -5.324269820295010e-11 5.410698930204520e-13 2026 02 21 12 61092.500 -1.485238263791627e-07 1.592476544656000e-07 7.305232556895595e-10 -7.092383850524181e-11 -5.359238484686310e-11 5.452578793578670e-13 2026 02 22 12 61093.500 -1.467042332266377e-07 1.596823930371499e-07 7.743603473864591e-10 -7.132315319242030e-11 -5.405487954802320e-11 5.495716397253560e-13 2026 02 23 12 61094.500 -1.434969095121427e-07 1.589560927007000e-07 8.230749343682585e-10 -7.174379453012330e-11 -5.455272008853910e-11 5.540056450175200e-13 2026 02 24 12 61095.500 -1.420896776296137e-07 1.592219639122899e-07 8.427900548867578e-10 -7.237634446530120e-11 -5.517274788358090e-11 5.581444254126490e-13 2026 02 25 12 61096.500 -1.416487549302347e-07 1.580720559554099e-07 8.667761235078578e-10 -7.306681526497930e-11 -5.587048134708220e-11 5.625287188763740e-13 2026 02 26 12 61097.500 -1.419816966895757e-07 1.575725437567899e-07 8.851424050369576e-10 -7.379907309366549e-11 -5.655054296428850e-11 5.668855485087480e-13 2026 02 27 12 61098.500 -1.420172295118717e-07 1.579009415928499e-07 9.005049535022590e-10 -7.449407454344530e-11 -5.721918411534860e-11 5.711897458569050e-13 2026 02 28 12 61099.500 -1.416960599157387e-07 1.579904949921299e-07 9.113996394555580e-10 -7.502200197841730e-11 -5.789741665479170e-11 5.753742071974040e-13 2026 03 01 12 61100.500 -1.417741103321797e-07 1.584208578350299e-07 9.188074247495596e-10 -7.548101874744209e-11 -5.859203462700050e-11 5.796644571537520e-13 2026 03 02 12 61101.500 -1.414278259743187e-07 1.589208202794400e-07 9.129516768567595e-10 -7.589769302449360e-11 -5.919450108007950e-11 5.834749925399250e-13 2026 03 03 12 61102.500 -1.402122837046827e-07 1.590609272350300e-07 9.227682207406571e-10 -7.619592117576290e-11 -5.967658117674740e-11 5.866883243030480e-13 2026 03 04 12 61103.500 -1.384634763450307e-07 1.605681724357800e-07 9.482857314160580e-10 -7.646554436045650e-11 -6.023540600657781e-11 5.897510184155830e-13 2026 03 05 12 61104.500 -1.367103255647357e-07 1.613135193693200e-07 9.802916020450583e-10 -7.680613387513700e-11 -6.082665803246700e-11 5.930305966293910e-13 2026 03 06 12 61105.500 -1.348355014908527e-07 1.619667116127499e-07 9.992392903723586e-10 -7.713304047653620e-11 -6.144093371892100e-11 5.960019099941210e-13 2026 03 07 12 61106.500 -1.344254576682547e-07 1.653364866078600e-07 1.016270116722160e-09 -7.751347107317430e-11 -6.204823123500150e-11 5.990748820435210e-13 2026 03 08 12 61107.500 -1.344632430902827e-07 1.674775561088300e-07 1.040220459273760e-09 -7.790785754072050e-11 -6.262068843992820e-11 6.021613055901690e-13 2026 03 09 12 61108.500 -1.326890663763657e-07 1.654551108516600e-07 1.065791282076358e-09 -7.832966102251250e-11 -6.299618454378440e-11 6.049572399059140e-13 2026 03 10 12 61109.500 -1.314226136037567e-07 1.642474888802300e-07 1.090093486937958e-09 -7.878425996714310e-11 -6.337880200093480e-11 6.080538081612450e-13 2026 03 11 12 61110.500 -1.304947770833337e-07 1.661423177049199e-07 1.110621714451960e-09 -7.933420062206800e-11 -6.374520901042810e-11 6.110195240589630e-13