Technical Note: An implementation of the dry removal processes DRY DEPosition and SEDImentation in the Modular Earth Submodel System (MESSy)

Abstract

Abstract. We present the submodels DRYDEP and SEDI for the Modular Earth Submodel System (MESSy). Dry deposition of gases and aerosols is calculated within DRY-DEP, whereas SEDI deals with aerosol particle sedimentation. Dry deposition velocities depend on the near-surface turbulence and the physical and chemical properties of the surface cover (e.g. the roughness length, soil pH or leaf stomatal exchange). The dry deposition algorithm used in DRY-DEP is based on the big leaf approach and is described in detail within this Technical Note. The sedimentation submodel SEDI contains two sedimentation schemes: a simple upwind zeroth order scheme and a first order approach.

Tropical tropospheric ozone column retrieval for GOME-2

“…The gas phase chemistry is calculated by the submodel MECCA (Sander et al, 2011) with a comprehensive stratospheric and tropospheric chemistry mechanism including NMHC chemistry (up to C4 plus isoprene). Aqueous phase chemistry and wet-scavenging are simulated by the submodel SCAV , dry deposition by the submodel DRYDEP (Kerkweg et al, 2006a), primary emissions by the submodels ONLEM, OFFLEM and TNUDGE (Kerkweg et al, 2006b). Monthly anthropogenic emissions representative for the year 2000 have been used for all simulated years from Lamarque et al (2010).…”

Earth System Chemistry integrated Modelling (ESCiMo) with the Modular Earth Submodel System (MESSy) version 2.51

“…Aerosol emissions as provided by the CCMI database are mapped on-line to the model grid using the algorithm of Jöckel (2006) in the new submodel IM-PORT (Kerkweg and Jöckel, 2015), vertically redistributed via OFFEMIS (Kerkweg et al, 2006b), and assigned to the corresponding aerosol species within GMXE. The physical loss processes sedimentation, dry deposition, wet scavenging, and aerosol activation are considered in the corresponding EMAC submodels Kerkweg et al, 2006a). The RC1-aero and RC1-aecl simulations consider the effect of phase partitioning of H 2 SO 4 , HNO 3 , HCl, and NH 3 , as well as the interaction of these compounds with primary aerosol species such as Na + , organic carbon (OC), black carbon (BC), and dust, resulting in overall feedbacks on the chemical composition of the atmosphere.…”

“…Within the MESSy submodel DDEP (formerly named DRYDEP; see Sect. 2; Kerkweg et al, 2006a), dry deposition velocities are calculated following the big leaf approach as proposed by Wesely (1989).…”

“…For the ice nucleation 20 % H 2 O supersaturation is assumed to be necessary. A trapezoid scheme (Buchholz, 2005;Kerkweg et al, 2006a) is used for the sedimentation of PSC particles.…”

ORACLE 2-D (v2.0): an efficient module to compute the volatility and oxygen content of organic aerosol with a global chemistry–climate model

“…ECHAM5 (Roeckner et al, 2006) serves as the atmospheric dynamic core that simulates atmospheric flow and is integrated in the base model layer of MESSy. The interface structure of MESSy links the base model with several atmospheric submodels that online simulate gas-phase chemistry (MECCA; Sander et al, 2011), inorganic aerosol microphysics and dynamics (GMXe; Pringle et al, 2010), organic aerosol formation and growth (ORACLE; Tsimpidi et al, 2014), emissions (ONLEM and OFFLEM; Kerkweg et al, 2006b), dry deposition and sedimentation (DRYDEP and SEDI; Kerkweg et al, 2006a), cloud scavenging (SCAV; Tost et al, 2006), cloud microphysics (CLOUD; Bacer et al, 2018), and aerosol optical properties (AEROPT; Lauer et al, 2007). EMAC has been extensively described and evaluated against ground-based and satellite observations (Pozzer et al, 2012;Tsimpidi et al, 2014Tsimpidi et al, , 2016Tsimpidi et al, , 2017Karydis et al, 2016Karydis et al, , 2017.…”