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Python气象数据处理|54.ERA5气压层数据API下载及合并

  • 2026-07-02 16:39:17
Python气象数据处理|54.ERA5气压层数据API下载及合并

前言

最近用 CDS API 下载了 ERA5 数据集的几个变量,遇到了一些坑,这里记录并分享给大伙,包含数据处理相关的代码。

下载数据步骤及注意事项

筛选数据

  1. 找到模板数据集,然后按需点选即

2.一定要注意右侧或下侧的"Request size"不能超标

  1. 打开 Show API request code,复制代码,粘贴到编辑器

实际案例及注意事项

批量下载多年每年的3-9月850hpa的比湿、风速

import cdsapiimport osfrom calendar import monthrangeclient = cdsapi.Client()dataset = "derived-era5-pressure-levels-daily-statistics"# 设置参数years = range(20052025)  # 2005-2024年months = range(310)      # 3-9月# 创建保存目录os.makedirs("./ERA5", exist_ok=True)for year in years:    for month in months:        # 获取该月天数        ndays = monthrange(year, month)[1]        days = [f"{d:02d}"for d in range(1, ndays + 1)]        # 构建请求        request = {            "product_type""reanalysis",            "variable": [                "specific_humidity",                "u_component_of_wind",                "v_component_of_wind",            ],            "year"str(year),            "month"f"{month:02d}",            "day": days,            "pressure_level": ["850"],            "daily_statistic""daily_mean",            "time_zone""utc+00:00",            "area": [3510015125],  # [north, west, south, east]        }        # 文件名:年-月.zip        zip_filename = f"./ERA5/{year}_{month:02d}.zip"        # 检查文件是否已存在        if os.path.exists(zip_filename):            print(f"文件 {zip_filename} 已存在,跳过下载")            continue        print(f"正在下载: {year}{month:02d}月...")        try:            # 下载并保存为zip文件            client.retrieve(dataset, request, zip_filename)            print(f"完成: {zip_filename}")        except Exception as e:            print(f"下载失败 {year}_{month:02d}{e}")

特别注意

client.retrieve(dataset, request, filename)

这里的filename一定要是zip后缀。大家在官网可以下载一天的数据,用Submit form提交,然后观察下载下来的数据,是zip文件。所以我们使用API下载的时候,也要设置为zip格式,里面一个压缩文件对应三个变量的nc文件。

检查与合并

检查是否下载的哪个文件数据有问题

from pathlib import Pathimport zipfilebad_files = []for f in Path(".").glob("*.zip"):try:        with zipfile.ZipFile(f, "r"as z:            z.testzip()   # 测试完整性    except Exception as e:        print(f"坏文件: {f}")        print(e)        bad_files.append(f)print("\n总坏文件数:"len(bad_files))

合并多个变量构建数据集

import osimport reimport zipfilefrom pathlib import Pathimport xarray as xrfrom tqdm import tqdmimport dask# ============================================================# 0. 工作目录与初始化# ============================================================os.chdir(r'你的数据路径')data_dir = Path("./")extract_root = Path("./unzipped")extract_root.mkdir(exist_ok=True)# ============================================================# 1. 解压(保持你原本的高效解压逻辑)# ============================================================pattern = re.compile(r"^\d{4}_\d{2}\.zip$")zip_files = sorted([f for f in data_dir.iterdir() if pattern.match(f.name)])print(f"发现 {len(zip_files)} 个 zip 文件\n开始解压...")for zip_path in tqdm(zip_files):    outdir = extract_root / zip_path.stem    if outdir.exists():        continue    outdir.mkdir(exist_ok=True)    try:        with zipfile.ZipFile(zip_path, "r"as z:            z.extractall(outdir)    except zipfile.BadZipFile:        print(f"坏文件,跳过: {zip_path}")        continueprint("解压完成")# ============================================================# 2. 最高效的单步读取与合并策略# ============================================================print("\n开始构建高效 Dask 延时读取任务...")# 找出所有的月度文件夹monthly_dirs = sorted([d for d in extract_root.iterdir() if d.is_dir()])# 定义一个预处理函数:负责在【单个文件夹内部】合并变量,完全避免全局对齐def process_single_month(month_dir):    # 使用 open_dataset 配合 chunks 开启懒加载    # drop_variables 确保不加载无关的冲突坐标    q_file = list(month_dir.glob("specific_humidity*.nc"))[0]    u_file = list(month_dir.glob("u_component*.nc"))[0]    v_file = list(month_dir.glob("v_component*.nc"))[0]    # 单个文件读取非常快,指定统一的 chunks    ds_q_m = xr.open_dataset(q_file, chunks={"valid_time"100})    ds_u_m = xr.open_dataset(u_file, chunks={"valid_time"100})    ds_v_m = xr.open_dataset(v_file, chunks={"valid_time"100})    # 局部合并(同一月份的坐标绝无冲突,xarray 不需要做复杂的对齐)    merged_m = xr.merge([ds_q_m, ds_u_m, ds_v_m])    return merged_m# 批量加载所有月份datasets = []for m_dir in tqdm(monthly_dirs, desc="构建时间链条"):    try:        datasets.append(process_single_month(m_dir))    except Exception as e:        print(f"文件夹 {m_dir.name} 读取失败,跳过. 错误: {e}")# 在时间维度(valid_time)上拼接所有月份(按顺序拼接,无需排序)print("\n懒加载拼接所有月份...")ds_final = xr.concat(datasets, dim="valid_time")print("\n最终数据结构:")print(ds_final)# ============================================================# 3. 压缩写出优化# ============================================================print("\n开始保存 NetCDF...")encoding = {    var: {        "zlib"True,        "complevel"4,      # 4级是性价比最高的平衡点        "dtype""float32"    }    for var in ds_final.data_vars}# 终极提速:在写入前,显式配置 Dask 并行诊断(可以看进度条)from dask.diagnostics import ProgressBarwith ProgressBar():    ds_final.to_netcdf(        "ERA5_q_uv_2005_2024.nc",        encoding=encoding    )print("\n完成!")

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  1. CONNECT:[ UseTime:0.000516s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000843s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000324s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000335s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000522s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000632s ]
  8. SELECT * FROM `article` WHERE `id` = 495326 LIMIT 1 [ RunTime:0.026115s ]
  9. UPDATE `article` SET `lasttime` = 1783062433 WHERE `id` = 495326 [ RunTime:0.003289s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.004089s ]
  11. SELECT * FROM `article` WHERE `id` < 495326 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002308s ]
  12. SELECT * FROM `article` WHERE `id` > 495326 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003740s ]
  13. SELECT * FROM `article` WHERE `id` < 495326 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.041105s ]
  14. SELECT * FROM `article` WHERE `id` < 495326 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005618s ]
  15. SELECT * FROM `article` WHERE `id` < 495326 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013263s ]
0.174189s