Hi all,

Hope all is well ,Joana here,

I wonder if you could help with a question, or at least point to someone who can.

I’ve downloaded the following variables from era5 single levels :

erver.retrieve('reanalysis-era5-single-levels',{

               "variable": ['10m_u_component_of_wind','10m_v_component_of_wind','10m_wind_gust_since_previous_post_processing'],

               "product_type": "reanalysis",

               "date": d,

               "time":['00:00','01:00','02:00',

                       '03:00','04:00','05:00',

                       '06:00','07:00','08:00',

                       '09:00','10:00','11:00',

                       '12:00','13:00','14:00',

                       '15:00','16:00','17:00',

                       '18:00','19:00','20:00',

                       '21:00','22:00','23:00'],

               "format": "netcdf"},"era5_daily_wind_{day}.nc".format(day=d))


I’ve noticed that for some days, the gust is less than the wind speeds, for example 22 March of 1992 this is what I get for lon=359 and lat=52.75:


date

time

gust

u10

v10

wind_speed

isless

22/03/1992

00:00:00

8.363686

2.185989

1.790482

2.825663409

NO

22/03/1992

01:00:00

5.292775

0.909042

2.067268

2.258307849

NO

22/03/1992

02:00:00

3.599795

0.983853

2.128776

2.345134108

NO

22/03/1992

03:00:00

3.184772

1.860088

1.868904

2.636802899

NO

22/03/1992

04:00:00

2.955884

3.354589

1.22999

3.572973938

YES

22/03/1992

05:00:00

2.59282

5.201647

0.069027

5.20210498

YES

22/03/1992

06:00:00

2.847359

5.788097

-0.72596

5.833445848

YES

22/03/1992

07:00:00

11.00181

5.741663

-1.36949

5.902728149

NO

22/03/1992

08:00:00

11.8049

4.867147

-2.5812

5.509238441

NO

22/03/1992

09:00:00

11.42013

3.493892

-4.31111

5.549140416

NO

22/03/1992

10:00:00

10.60784

1.120577

-4.4595

4.59813268

NO

22/03/1992

11:00:00

12.25807

3.023529

-3.9659

4.986989736

NO

22/03/1992

12:00:00

12.95196

5.26442

-4.20962

6.740552184

NO

22/03/1992

13:00:00

14.06352

6.197408

-4.79626

7.83657629

NO

22/03/1992

14:00:00

14.7857

6.271359

-4.73859

7.860292479

NO

22/03/1992

15:00:00

14.88501

6.457097

-4.77857

8.03298525

NO

22/03/1992

16:00:00

14.90606

6.641974

-4.43182

7.984788484

NO

22/03/1992

17:00:00

13.86686

5.997912

-3.07557

6.740480178

NO

22/03/1992

18:00:00

12.47643

5.832812

-2.33363

6.282318054

NO

22/03/1992

19:00:00

11.1031

5.781218

-1.92614

6.093643656

NO

22/03/1992

20:00:00

10.84462

5.782078

-1.61322

6.00290722

NO

22/03/1992

21:00:00

10.66309

5.738223

-1.13192

5.848798107

NO

22/03/1992

22:00:00

10.3875

5.359869

-0.75441

5.412700999

NO

22/03/1992

23:00:00

10.08232

5.487133

-0.82591

5.548942526

NO


As you see from 04am to 06am the wind gust is less than the wind speed. Is there any problem with the data ?


I am attaching the .xlsx:  check_gust_March_22_1992_era5.xlsx


Hope to have some feedback soon

Kind Regards

Joana

1 Comment

  1. Dear Joana,

    Our scientist will look into this.

    Kind regards,

    Xiaobo