之间的区别是什么高分辨率模型和常规模型运行?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 04 - 08 - t20:50:51z //www.hoelymoley.com/feeds/question/941 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/941 14 之间的区别是什么高分辨率模型和常规模型运行? hichris123 //www.hoelymoley.com/users/20 2014 - 05 - 16 - t01:47:13z 2014 - 05 - 21 - t20:03:49z < p >我们有高分辨率模型像< a href = " http://rapidrefresh.noaa.gov/HRRR/ " > HRRR < / >(高分辨率快速刷新)。但究竟是高分辨率模型和常规模型之间的区别吗?我意识到高分辨率模型更准确,但这是为什么呢?有更多的数据输入电脑吗?< / p > < p >,有一个模型必须满足的标准被称为高分辨率,或者只是一个任意的名字吗? < / p > //www.hoelymoley.com/questions/941/-/943 # 943 22 凯西回答的有什么区别高分辨率模型和常规模型运行? 凯西 //www.hoelymoley.com/users/64 2014 - 05 - 16 - t03:02:06z 2014 - 05 - 21 - t18:17:39z < p >高分辨率意味着网格模型使用是可以的,换句话说,美元美元dx, dy,美元dz,美元和dt小美元数字。像HRRR模型使用一个3公里水平分辨率,而一些老的区域模型使用30公里水平分辨率(即使这些天南使用5公里)。比较决议GFS和ECMWF模式是少一点简单的因为这些模型解决球面坐标系统利用光谱方法,和解决将随纬度)。< / p > < p >高水平网格分辨率也意味着更高的垂直分辨率和较小的步伐。垂直分辨率将想要避免的结果大纵横比你的网格框和较小的步伐是数值稳定的必要性(见< a href = " http://en.wikipedia.org/wiki/Courant%E2%80%93Friedrichs%E2%80%93Lewy_condition " > < / >节能灯标准)。最大的直接结果增加分辨率和减少步伐大幅增加内存和计算需求增加。因此,运营多久决议将是有限的预测模型是可以接受的模型运行输出可用之前,这是一个超级计算机处理数据的函数。你通常会发现比操作non-forecast研究更高的分辨率设置。例如,我模拟是由超级单体雷暴与250水平分辨率,但我也可以备用一天来模拟几个小时而操作模型只有几个小时来模拟在一个更大的比我使用的域。< / p > < p >我不相信有一个特定的请求调用模型“高分辨率”,我认为你会发现隐含的决议将截然不同的气候模型和中尺度modeler。< / p > < p >准确性的差异在高分辨率模型通常可以归结为解决更多的物理显式。模型运行30公里分辨率不能解决对流(雷雨),而且必须用参数表示这是一个sub-gridscale效果。 You might see terms like "cloud resolving" applied to high resolution models because of this. A model running at 3 km resolution will be able to explicitly resolve convection. A large eddy simulation (using filtered Navier-Stokes equations) will be limited to resolving eddies on a scale based on the grid resolution, and will parameterize the smaller scales. Please see this paper1 for further discussion on the impact of resolution on resolving deep moist convection.

Finally, the data going into the model will make a difference (weather is chaotic and extremely sensitive to the initial conditions). The HRRR is initialized from the RAP with a data assimilation period for observed radar. RAP is currently a 13 km model but is moving to 3 km this summer. RAP gets its background fields from GFS and assimilates quite a bit of data on top of that. While the smaller grid boxes help capture more of the physics, the quality of the data fed into the model is also helping quite a bit with accuracy because it improves the initial conditions.

  1. Bryan, George H., John C. Wyngaard, J. Michael Fritsch, 2003: Resolution Requirements for the Simulation of Deep Moist Convection. Mon. Wea. Rev., 131, 2394–2416. doi: http://dx.doi.org/10.1175/1520-0493(2003)131<2394:RRFTSO>2.0.CO;2
 //www.hoelymoley.com/questions/941/-/953 # 953 8 半日西蒙回答的有什么区别高分辨率模型和常规模型运行? 半日西蒙 //www.hoelymoley.com/users/39 2014 - 05 - 19 - t08:53:25z 2014 - 05 - 19 - t08:53:25z < p >只是添加一些更多的重量一点凯西的出色的回答:< / p > < p >没有单一的定义“高分辨率”意味着什么。不同的领域,因此不同类型的造型,会有不同的看法。< / p > < p >同时,即使在一个领域,解决一个模型必须被称为“高”会增加可用的计算能力随着时间增加。例如,< a href = " http://cat.inist.fr/?aModele=afficheN&cpsidt=4559180">this paper from 1993 describes a regional tidal model as "high-resolution" with a grid size of approximately 1km. Eighteen years later, this paper uses "high resolution" to describe a 50m grid (it's a nested grid, and this resolution is only in the area of interest, but the point is that the meaning of the term has changed within the same type of modelling).
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