用python循环计算sst.mon.mean.nc几十年来每个月这个区域内大于28摄氏度的温度格点数以及平均值
时间: 2024-05-05 15:19:47 浏览: 155
要计算sst.mon.mean.nc文件中某个区域内大于28摄氏度的温度格点数以及平均值,可以按照以下步骤进行:
1. 导入需要的库和模块:
```python
import numpy as np
from netCDF4 import Dataset
```
2. 打开sst.mon.mean.nc文件并读取需要的变量:
```python
nc_file = Dataset('sst.mon.mean.nc')
sst = nc_file.variables['sst'][:]
lat = nc_file.variables['lat'][:]
lon = nc_file.variables['lon'][:]
```
3. 定义需要计算的区域:
```python
lat_min = -10
lat_max = 10
lon_min = 120
lon_max = 160
lat_idx = np.where((lat >= lat_min) & (lat <= lat_max))[0]
lon_idx = np.where((lon >= lon_min) & (lon <= lon_max))[0]
sst_region = sst[:, lat_idx, :][:, :, lon_idx]
```
4. 循环计算每个月大于28摄氏度的温度格点数以及平均值:
```python
n_points = []
mean_temp = []
for i in range(sst_region.shape[0]):
sst_month = sst_region[i, :, :]
n_points_month = np.sum(sst_month > 28)
mean_temp_month = np.mean(sst_month[sst_month > 28])
n_points.append(n_points_month)
mean_temp.append(mean_temp_month)
```
其中,n_points列表保存了每个月大于28摄氏度的温度格点数,mean_temp列表保存了每个月大于28摄氏度的温度格点的平均值。
完整代码如下:
```python
import numpy as np
from netCDF4 import Dataset
nc_file = Dataset('sst.mon.mean.nc')
sst = nc_file.variables['sst'][:]
lat = nc_file.variables['lat'][:]
lon = nc_file.variables['lon'][:]
lat_min = -10
lat_max = 10
lon_min = 120
lon_max = 160
lat_idx = np.where((lat >= lat_min) & (lat <= lat_max))[0]
lon_idx = np.where((lon >= lon_min) & (lon <= lon_max))[0]
sst_region = sst[:, lat_idx, :][:, :, lon_idx]
n_points = []
mean_temp = []
for i in range(sst_region.shape[0]):
sst_month = sst_region[i, :, :]
n_points_month = np.sum(sst_month > 28)
mean_temp_month = np.mean(sst_month[sst_month > 28])
n_points.append(n_points_month)
mean_temp.append(mean_temp_month)
```
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