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CFS 气候预报数据python下载

  • 2026-07-02 19:13:55
CFS 气候预报数据python下载

数据集介绍

    CFS(Climate Forecast System,气候预报系统)是由美国国家环境预报中心(NCEP)开发的新一代全球气候预报系统。它基于耦合的大气-海洋-陆地-海冰模式,提供从次季节到季节尺度(最长9个月)的预测产品。

    CFSv2(第二版)于2011年业务化运行,每天运行四次(00、06、12、18 UTC),但通常只有12 UTC循环输出完整的日平均/日累积场,是最常用的数据版本。

数据集特点

  • 时间范围:预报时长0–9个月(逐日输出)

  • 空间分辨率:约0.5°×0.5°(T382谱截断,高斯网格)

  • 变量丰富:包含大气、海洋、陆面、海冰等数百个要素

  • 数据格式:GRIB2(二进制格点格式)

  • 数据量:单日全部变量约10–15 GB,常用表层变量约500 MB

常用要素详解

变量代码
全称
单位
物理含义
典型用途
wnd10m
10米风速(U/V分量)
m/s
地面10米高度的水平风速(含经向和纬向分量)
风能评估、海浪预报、污染物扩散
prmsl
海平面气压
Pa
经过高度订正至海平面的气压
识别高低压系统、风暴路径追踪
cprat
对流性降水率
kg·m⁻²·s⁻¹
仅由对流过程产生的瞬时降水速率
强对流预警、洪水早期识别
pwat
可降水量
kg·m⁻²
单位面积气柱内的总水汽含量(积分从地表到大气顶)
干旱监测、飞机积冰潜势
tmp2m
2米温度
K
地面2米高度的空气温度
农业霜冻、人体舒适度、能源需求
soilt1
土壤温度(第一层)
K
地表以下0–0.1 m土层的温度
土壤热状况、作物生长模型
q2m
2米比湿
kg·kg⁻¹
单位质量湿空气中的水汽质量(2米高度)
雾预报、灌溉规划、热浪分析
prate
总降水率
kg·m⁻²·s⁻¹
对流+大尺度降水合计的瞬时速率
总降水量估算、水资源管理

数据获取

CFS数据通过NCEP的NOMADS(NOAA Operational Model Archive and Distribution System)服务器公开提供:

点击数据下载官网

文件名规则

 变量名.01.YYYYMMDDHH.daily.grb2

  • 01 表示预报成员(CFSv2仅一个成员)

  • YYYYMMDDHH:起报时间和时次(HH=12)

  • daily:日平均(对连续场)或日累积(对通量场)

手动下载

# 进入目标目录wget https://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod/cfs.20260531/12/time_grib_01/wnd10m.01.2026053112.daily.grb2

批量下载

date=20260531hour=12base_url="https://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod/cfs.${date}/${hour}/time_grib_01"for var in wnd10m prmsl cprat pwat tmp2m soilt1 q2m prate; do    wget ${base_url}/${var}.01.${date}${hour}.daily.grb2done

python下载

#!/usr/bin/env python3"""CFS数据下载器 - 精简版从 NOAA NOMADS 服务器下载指定日期的CFS日平均/日累积GRIB2文件。支持断点续传、自动重试、本地按年/月/日目录归档。"""import osimport sysimport argparseimport requestsfrom datetime import datetime, timedeltafrom pathlib import Pathfrom typing import ListOptional# ==================== 配置区域(可根据需要修改) ====================DEFAULT_VARS = [    'wnd10m''prmsl''cprat''pwat',    'tmp2m''soilt1''q2m''prate']BASE_URL = "https://nomads.ncep.noaa.gov/pub/data/nccf/com/cfs/prod"CYCLE_HOUR = 12          # 固定使用12 UTC循环(日平均数据最完整)LOCAL_ROOT = "./cfs_data"   # 本地存储根目录RETRY_TIMES = 3TIMEOUT = 60# ================================================================def get_target_date(date_str: Optional[str]) -> datetime:    """解析日期参数,默认前一天"""    if date_str:        return datetime.strptime(date_str, '%Y%m%d')    # 默认前一天(因为当天数据可能未完全生成)    return datetime.now() - timedelta(days=1)def build_local_path(date: datetime, filename: str) -> Path:    """本地存储路径:LOCAL_ROOT/YYYY/MM/DD/filename"""    target_dir = Path(LOCAL_ROOT) / date.strftime('%Y/%m/%d')    target_dir.mkdir(parents=True, exist_ok=True)    return target_dir / filenamedef build_remote_url(date: datetime, var: str) -> str:    """构建远程文件URL"""    date_str = date.strftime('%Y%m%d')    hour_str = f"{CYCLE_HOUR:02d}"    filename = f"{var}.01.{date_str}{hour_str}.daily.grb2"    url = f"{BASE_URL}/cfs.{date_str}/{hour_str}/time_grib_01/{filename}"    return urldef download_file(url: str, local_path: Path) -> bool:    """下载单个文件(支持重试、临时文件保护)"""    for attempt in range(1, RETRY_TIMES + 1):        try:            print(f"[{attempt}/{RETRY_TIMES}] 下载: {url}")            resp = requests.get(url, stream=True, timeout=TIMEOUT)            resp.raise_for_status()            # 先写入临时文件,避免不完整文件            tmp_path = local_path.with_suffix('.tmp')            with open(tmp_path, 'wb'as f:                for chunk in resp.iter_content(chunk_size=8192):                    f.write(chunk)            tmp_path.rename(local_path)            file_size = local_path.stat().st_size            print(f"成功: {local_path} ({file_size} bytes)")            return True        except Exception as e:            print(f"下载失败: {e}")            if attempt < RETRY_TIMES:                wait = 2 ** (attempt - 1)  # 指数退避: 1s,2s,4s                print(f"等待 {wait} 秒后重试...")                import time                time.sleep(wait)    print(f"最终失败: {url}")    return Falsedef clean_old_files(days: int = 30):    """删除超过指定天数的本地CFS文件"""    cutoff = datetime.now() - timedelta(days=days)    deleted = 0    for root, _, files in os.walk(LOCAL_ROOT):        for f in files:            if not f.endswith('.daily.grb2'):                continue            # 从文件名提取日期:变量.01.YYYYMMDDHH.daily.grb2            parts = f.split('.')            if len(parts) >= 4:                date_part = parts[2][:8]  # YYYYMMDD                try:                    file_date = datetime.strptime(date_part, '%Y%m%d')                    if file_date < cutoff:                        os.remove(os.path.join(root, f))                        deleted += 1                except ValueError:                    pass    print(f"清理完成: 删除 {deleted} 个超过 {days} 天的文件")def main():    parser = argparse.ArgumentParser(description='CFS数据下载器(精简版)')    parser.add_argument('-d''--date'help='下载指定日期,格式 YYYYMMDD(默认前一天)')    parser.add_argument('-v''--vars', nargs='+', default=DEFAULT_VARS,                        help=f'要下载的变量名,默认: {" ".join(DEFAULT_VARS)}')    parser.add_argument('--clean'type=int, metavar='DAYS', default=30,                        help='清理超过DAYS天的本地文件(默认30天)')    parser.add_argument('--no-clean', action='store_true'help='跳过清理步骤')    args = parser.parse_args()    target_date = get_target_date(args.date)    print(f"目标日期: {target_date.strftime('%Y-%m-%d')} (UTC+0, 循环时次 {CYCLE_HOUR:02d}Z)")    success = 0    total = len(args.vars)    for var in args.vars:        url = build_remote_url(target_date, var)        local_path = build_local_path(target_date, url.split('/')[-1])        if local_path.exists() and local_path.stat().st_size > 0:            print(f"跳过已存在: {local_path}")            success += 1            continue        if download_file(url, local_path):            success += 1    print(f"下载完成: 成功 {success}/{total}")    if not args.no_clean:        clean_old_files(args.clean)if __name__ == '__main__':    main()

下载案例

CMC 全球确定性预报数据下载指南
低空经济的核心是气象保障
CMA-GFS气象数据转换到Zarr格式技术解析
全球气候变暖让飞机更颠簸了吗?
电离层对地基雷达测量精度的影响分析与校正方法

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  1. CONNECT:[ UseTime:0.001349s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000989s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004767s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002533s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000746s ]
  6. SELECT * FROM `set` [ RunTime:0.000668s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000693s ]
  8. SELECT * FROM `article` WHERE `id` = 496944 LIMIT 1 [ RunTime:0.009272s ]
  9. UPDATE `article` SET `lasttime` = 1783006065 WHERE `id` = 496944 [ RunTime:0.009286s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001470s ]
  11. SELECT * FROM `article` WHERE `id` < 496944 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001126s ]
  12. SELECT * FROM `article` WHERE `id` > 496944 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000966s ]
  13. SELECT * FROM `article` WHERE `id` < 496944 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007727s ]
  14. SELECT * FROM `article` WHERE `id` < 496944 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014306s ]
  15. SELECT * FROM `article` WHERE `id` < 496944 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004945s ]
0.135071s