Issues

• Question: can this be used to predict future conditions?

  FESOM/fesom2#1240 · Filter by author ttebche1 opened on Oct 29, 2026
  3

• Standalone ERA5 forcing double counts snowfall when total precipitation is supplied as rain

  FESOM/fesom2#1232 · Filter by author sebastianbeyer opened on Oct 28, 2026
  4

• Coupled AWI-CM3: ocean albedo applied twice in the shortwave penetration (cal_shortwave_rad)

  FESOM/fesom2#1230 · Filter by author a270067 opened on Oct 25, 2026

• Sea-ice cut_off deletes ice without a salt or freshwater flux (zstar: ~2e11 psu m³ of salt a year on CORE2)

  FESOM/fesom2#1229 · Filter by author koldunovn opened on Oct 24, 2026

• Heat capacity of sea water: vcpw is above the TEOS-10 range, and ocean, sea ice and diagnostics use different values

  handbook-auditquestion
  FESOM/fesom2#1193 · Filter by author JanStreffing opened on Oct 13, 2026 · FESOM 2.8.4

• Step log prints integrals of deta, hflux, temp and salt that are never computed (always 0)

  bughandbook-audit
  FESOM/fesom2#1171 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• KE budget, split-explicit SSH solver: barotropic correction enters ke_du2 but no budget term

  bughandbook-audit
  FESOM/fesom2#1170 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• DVD: vertical diffusion counted twice with i_vert_diff=.false.; intent(in) velocities modified

  bughandbook-audit
  FESOM/fesom2#1169 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• dMOC: stale densities and level-1 coefficients at ice-shelf cavities; class rule not uniform

  bughandbook-audit
  FESOM/fesom2#1168 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• CMOR heat/salt tendencies omit the thickness change; hc300m/hc700m stop above the target depth

  bughandbook-audit
  FESOM/fesom2#1167 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4
  2

• Tides: scalar self-attraction and loading term is explicit while the SSH solver uses the full g

  handbook-auditquestion
  FESOM/fesom2#1166 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• IDEMIX2 M2/NIW compartments: depth-weighted transport, refraction on rotated meshes, shelf time scale, output units

  bughandbook-audit
  FESOM/fesom2#1164 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Water isotopes: global H2(16)O flux correction is subtracted from both the ocean and the ice flux

  bughandbook-audit
  FESOM/fesom2#1163 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• NCAR bulk: fluxes use unshifted 2 m T and q, and another q_sat and wind than the coefficients

  bughandbook-audit
  FESOM/fesom2#1161 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Icepack builds: EVP does not use Icepack's ice strength; m_ice_old is filled with a_ice

  bughandbook-audit
  FESOM/fesom2#1160 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• namelist.ice: theta_io is read in radians and by one solver only; new_iclasses needs iclasses=15

  bughandbook-audit
  FESOM/fesom2#1159 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Dynamic backscatter (opt_visc=8): loops ignore ulevels in cavities; cap on v_back never acts

  bughandbook-audit
  FESOM/fesom2#1158 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Namelist switches that do nothing or have undocumented side effects; unconditional salinity clip

  handbook-auditquestion
  FESOM/fesom2#1157 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Code defaults of namelist parameters differ from the shipped namelists

  enhancementhandbook-audit
  FESOM/fesom2#1156 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Documentation and comments contradict the code: metric term, GM taper under MLE, AB2 offset

  handbook-auditquestion
  FESOM/fesom2#1153 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4
  2

  

• PPM vertical tracer advection combines its own time centring with the Adams-Bashforth tracer

  bughandbook-audit
  FESOM/fesom2#1152 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• cvmix_TIDAL: the Prandtl number used for the tidal viscosity is never set

  bughandbook-audit
  FESOM/fesom2#1151 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4

• Cavities: meltwater enters with the local salinity and temperature when use_cavity_fw2press is on

  bughandbook-audit
  FESOM/fesom2#1149 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4
  2

• IDEMIX: horizontal propagation smooths iwe every step, depends on the partitioning, and loses energy at topographic steps

  handbook-audit
  FESOM/fesom2#1147 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4
  

• Tracking: defects found while writing the FESOM2.8 handbook (D01–D82)

  handbook-audit
  Task

  FESOM/fesom2#1130 · Filter by author JanStreffing opened on Oct 12, 2026 · FESOM 2.8.4
  2