( 2014) evaluated the SW bias in a number of GCMs and found ( 2018) and has been the subject of many studies.īodas-Salcedo et al. In general circulation models (GCMs), with a bias over the SO of up to 30 W m −2, is a problem documented well by Trenberth and Fasullo ( 2010) and Particularly common ( Mace et al., 2009). Over the Southern Ocean (SO),Ĭloud cover is very high at over 80 %, with boundary layer clouds being Low albedo of the sea surface compared to land. Oceans are especially important for determining the radiation budget due to the Global climate sensitivity ( Boucher et al., 2013 Flato et al., 2014 Bony et al., 2015). Underestimation, relative to underestimation of cloud albedo.Ĭlouds are considered one of the largest sources of uncertainty in estimating GA7.1 a major part of the SW radiation bias can be explained by cloud cover Our results suggest that subgrid-scale processes (cloud andīoundary layer parameterisations) are responsible for the bias and that in MERRA-2 has a much greater proportion of cloud liquid water in the SO inĪustral summer than GA7.1, a likely key contributor to the difference in the SW Relationship between boundary layer stability and clouds well.
GA7.1 and MERRA-2 do not represent the observed To be strongly linked to boundary layer atmospheric stability and the sea Based on radiosonde observations, we also find the low cloud Occurrence relative to the ship observations on average by 4 %–9 % (GA7.1) andġ8 % (MERRA-2). Simulator, we find that GA7.1 and MERRA-2 both underestimate low cloud and fog Utilising a novel surface lidar simulatorĭeveloped for this study, derived from an existing Cloud Feedback Model Intercomparison Project (CFMIP) Observation Simulator Package (COSP) – active remote sensing simulator (ACTSIM) spaceborne lidar
We find low cloud below 2 km to be predominant in the Ross Sea and the Using ship-based ceilometer observations, Performs better than MERRA-2 in terms of absolute SW bias. The prevailing bias is negative in GA7.1 and positive in MERRA-2. (GA) version 7.1 of the HadGEM3 GCM and the MERRA-2 reanalysis. We use multi-year ship-based observations and the CERES spaceborne radiation budget measurements to contrast cloud representation and SW radiation in the atmospheric component Global Atmosphere The problem has been the focus of many studies, most of which utilised satellite datasets for model evaluation. These biases have been attributed to deficiencies in the representation of clouds during the austral summer months, either due to cloud cover or cloud albedo being too low. If you don't think any of the above situations apply, you can use this feedback form to request a review of this block.Southern Ocean (SO) shortwave (SW) radiation biases are a common problem in contemporary general circulation models (GCMs), with most models exhibiting a tendency to absorb too much incoming SW radiation. Contact your IT department and let them know that they've gotten banned, and to have them let us know when they've addressed the issue.Īre you browsing GameFAQs from an area that filters all traffic through a single proxy server (like Singapore or Malaysia), or are you on a mobile connection that seems to be randomly blocked every few pages? Then we'll definitely want to look into it - please let us know about it here. You'll need to disable that add-on in order to use GameFAQs.Īre you browsing GameFAQs from work, school, a library, or another shared IP? Unfortunately, if this school or place of business doesn't stop people from abusing our resources, we don't have any other way to put an end to it. When we get more abuse from a single IP address than we do legitimate traffic, we really have no choice but to block it. If you don't think you did anything wrong and don't understand why your IP was banned.Īre you using a proxy server or running a browser add-on for "privacy", "being anonymous", or "changing your region" or to view country-specific content, such as Tor or Zenmate? Unfortunately, so do spammers and hackers.
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