HYSPLIT Learning Resources

1. HYSPLIT后向轨迹制作. 2020-01-05
2. HYSPLIT聚类后向模拟及浓度扩散模拟. 2021-01-19
3. NESDIS STAR, here.

Hysplit: Run a Sample Concentration Simulation

快捷方法，按照如图所示的步骤，单击‘Run Example’，就会得到运行的结果。

Quick method: follow the steps shown in the figure and click "Run Example" to obtain the results.

进一步，如果编辑运行需要的参数，请按照下面的步骤：

To proceed further and edit the parameters required for the run, please follow the steps below:

Step 1 配置参数 Configure Pollutant and Grid

在Concentration之下单击‘Setup Run’，在弹出的窗口再继续单击‘Pollutant, Deposition and Grids setup’，就可以在打开的新窗口对于Pollutant等进行调整，不过此为示例，已经调整到位了，无需再调整。

Under the ‘Concentration’ tab, click ‘Setup Run’. In the pop-up window, click ‘Pollutant, Deposition and Grids setup’ to open a new window where you can adjust the settings for the pollutant and related parameters. However, since this is just a sample, the settings have already been configured, and no further adjustments are needed.

Pollutant: Emission characteristics (e.g., emission rate, species like “TEST”).

Grid: Define the concentration grid (latitude-longitude intersections, resolution, and averaging period).

Deposition (optional): Parameters for deposition if needed.

全部单击‘Save’，保存这些配置。

Click ‘Save’ for each window to save the configurations.

Step 2 运行配置 Run the Simulation

在Concentration之下单击‘Run Model’，就开始运行，运行结束如下图。

Click ‘Run Model’ under the ‘Concentration’ tab to start the simulation. Once the run is complete, you will see the result as shown below.

Step 3 查看结果 View Output

按照下图的示意，单击‘Contours’，在新窗口有许多参数，可以尝试调整，也可以选择默认的配置，确定后执行‘Execute Display’。

As shown in the image below, click ‘Contours’. In the new window, you'll find many parameters available for adjustment. You can experiment with these settings or proceed with the default configuration. Once ready, click ‘Execute Display’ to generate the output.

最终弹出来的结果如下图。

The final output is shown in the image below.

Hysplit: Step-by-Step Guide to Use HYSPLIT GUI’s Built-in FTP Client

如下图所示，单击Archive。

As shown in the figure below, click ‘Archive’.

对于初学者来说，GDAS数据是一个不错的选择，覆盖全球，常用于Hysplit的模拟。其它方面请按照自己的需求而定，主要就是时间区间及下载位置，这里只是一个示例。设定好之后，就可以单击‘FTP Data File’开始下载。

For beginners, GDAS data is a good choice as it provides global coverage and is commonly used for HYSPLIT simulations. Other settings should be configured based on your specific needs, mainly the time range and download location—this is just an example. Once everything is set, you can click "FTP Data File" to start the download.

当出现‘FTP complete’，就表示下载完成了，此过程下载的文件名为‘gdas1.may24.w4’，位置在working文件夹。这就是一个简单的FTP下载过程。

When "FTP complete" appears, it means the download has finished. The downloaded file is named "gdas1.may24.w4" and is located in the ‘working’ folder. This is a simple FTP download process.

HRRR(High-Resolution Rapid Refresh)

High-Resolution: HRRR is a high-resolution weather model, meaning it operates on a fine spatial grid to capture detailed weather patterns. Specifically, it uses a 3-km horizontal resolution, allowing it to resolve smaller-scale phenomena like thunderstorms or local wind patterns that coarser models (e.g., GFS at 0.25-degree resolution) might miss.

Rapid Refresh: HRRR is updated frequently—every hour—with new data assimilation and forecasts. This rapid update cycle makes it ideal for short-term, real-time weather predictions, typically out to 18 hours (with some experimental runs extending to 48 hours).

Note

GDAS one-degree archive (Dec 2004 - present)

Currently Available Data

Hysplit: To run the sample data

Hysplit安装成功后，其实就已经包含了示例数据，它位于安装位置的子目录working里面，请检查是否含有这三个文件oct1618.BIN（该文件是ARL格式的气象数据）/sample_traj/sample_conc。其中sample_traj定义了模拟过程的起始位置。

Once HYSPLIT is successfully installed, it already includes sample data located in the working subdirectory of the installation folder. Please check whether the following three files are present: oct1618.BIN (which is meteorological data in ARL format), sample_traj, and sample_conc. The sample_traj file defines the starting location for the simulation.

Step 1 双击“Run Hysplit” Double-click “Run HYSPLIT”

看到如下图所示的GUI，含有Meteorology/Trajectory/Concentration/Advanced.

You will see a GUI as shown below, which includes the tabs: Meteorology, Trajectory, Concentration, and Advanced.

Step 2 单击Trajectory Click on Trajectory

单击Trajectory后，选择Quick Start和Run Example。它会依据预定义的sample_traj开始运行oct1618.BIN。

After clicking 'Trajectory', select 'Quick Start' and then 'Run Example'. It will run based on the predefined `sample_traj` using the `oct1618.BIN` file.

'starting time'等在此软件使用的都是UTC时间，注意与希望的时间进行换算。

In this software, terms like “starting time” are all based on UTC. Please remember to convert accordingly to your desired local time.

几乎瞬间会得到一个运行结果，如下所示，黑色的星号就是计算的起始位置。

The result will appear almost instantly, as shown below. The black asterisk indicates the starting location of the calculation.

这就是一个非常简易的利用自带数据的操作过程。

This is a very simple operation process using the built-in data.

Step 3 查验气象数据 Verify Meteorological Data

在Trajactory之下找到Setup Run，弹出如下所示的配置窗口。

Under ‘Trajectory’, find and click ‘Setup Run’, and a configuration window like the one shown below will pop up.

在Selected Files，已经列出了oct1618.BIN文件，如果没有列出该文件，请通过“Add Meteorology Files”添加该文件。

In ‘Selected Files’, the file ‘oct1618.BIN’ should already be listed. If it is not, please click ‘Add Meteorology Files’ to add it manually.

单击“Setup starting locations”，如下图，你就会看到初涉的起始点是同一位置的不同高度，当然可以被修改为不同的位置或者高度。

Click ‘Setup starting locations’ (as shown below), and you will see that the initial starting points are set to the same location at different altitudes. Of course, these can be modified to different locations or altitudes as needed.

Step 4 运行此配置 Run the Simulation

单击Trajectory之下的Run Model，运行之后会得到如下结果。

Click ‘Run Model’ under the ‘Trajectory’ tab. After running, you will get the following results.

这个模拟的过程就是利用气象数据oct1618.BIN来得到的结果。

Click 'Run Model' under the 'Trajectory' tab. After execution, the results will be displayed as shown below.

Step 5 查看结果 View the output

Trajectory->Display->Trajectory，得到如下图所示，稍有调整，单击Execute Display。

Go to Trajectory → Display → Trajectory, as shown below. Make slight adjustments if needed, then click 'Execute Display'.

立即就得到一个展示结果，如下图。

The display result will appear immediately, as shown below. The trajplot program will run, generating trajplot.html in the working directory, as indicated by "Output will be in SVG".

同时，与结果一同输出的还有MESSAGE和tdump，他们也在working之下，可以作为运行过程相关参数的参考。

At the same time, the output also includes the MESSAGE and tdump files, which are located under the working directory. These files can serve as a reference for the parameters used during the run.

Matlab: Convert the SatPM2.5 NC to Geotiff

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References

1. SatPM2.5 (Satellite-derived PM2.5)

MATLAB: Image Surface and Edge Boundary

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