# ARTS built-in documentation server

## Workspace Method surfaceTessem

### Description

TESSEM sea surface microwave emissivity parametrization. This method computes surface emissivity and reflectivity matrices for ocean surfaces using the TESSEM emissivity model: Prigent, C., et al. Sea‐surface emissivity parametrization from microwaves to millimetre waves, QJRMS, 2017, 143.702: 596-605. The validity range of the parametrization of is 10 to 700 GHz, but for some extra flexibility frequencies between 5 and 900 GHz are accepted. The accepted temperaute range for surface_skin_t is [260.0 K, 373.0 K] The model itself is represented by the neural networks in tessem_neth and tessem_netv.

**Authors: **Simon Pfreundschuh

### Synopsis

surfaceTessem( | surface_los, surface_rmatrix, surface_emission, atmosphere_dim, stokes_dim, f_grid, rtp_pos, rtp_los, surface_skin_t, tessem_neth, tessem_netv, salinity, wind_speed ) |

### Variables

OUT | surface_los | (Matrix) | Downwelling radiation directions to consider in surface reflection. |

OUT | surface_rmatrix | (Tensor4) | The reflection coefficients for the directions given by surface_los to the direction of interest. |

OUT | surface_emission | (Matrix) | The emission from the surface. |

IN | atmosphere_dim | (Index) | The atmospheric dimensionality (1-3). |

IN | stokes_dim | (Index) | The dimensionality of the Stokes vector (1-4). |

IN | f_grid | (Vector) | The frequency grid for monochromatic pencil beam calculations. |

IN | rtp_pos | (Vector) | Position of a radiative transfer point. |

IN | rtp_los | (Vector) | Line-of-sight at a radiative transfer point. |

IN | surface_skin_t | (Numeric) | Surface skin temperature. |

IN | tessem_neth | (TessemNN) | TESSEM2 neural network parameters for horizontal polarization. |

IN | tessem_netv | (TessemNN) | TESSEM2 neural network parameters for vertical polarization. |

GIN | salinity | (Numeric, Default: 0.035) | Salinity, 0-1. That is, 3% is given as 0.03. |

GIN | wind_speed | (Numeric) | Wind speed. |