A case study of wind farm effects using two wake parameterizations in the Weather Research and Forecasting (WRF) model (V3.7.1)  in the presence of low-level jets

Larsén, Xiaoli G.; Fischereit, Jana

doi:https://doi.org/10.5194/gmd-14-3141-2021

Articles | Volume 14, issue 6

https://doi.org/10.5194/gmd-14-3141-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-14-3141-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 14, issue 6

Model evaluation paper

|

02 Jun 2021

Model evaluation paper |

| 02 Jun 2021

A case study of wind farm effects using two wake parameterizations in the Weather Research and Forecasting (WRF) model (V3.7.1) in the presence of low-level jets

Xiaoli G. Larsén and Jana Fischereit

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Final revised paper (published on 02 Jun 2021)
Preprint (discussion started on 22 Dec 2020)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Review', Simon Siedersleben, 02 Feb 2021
- AC1: 'Reply on RC1', Xiaoli Larsén, 22 Mar 2021
- AC2: 'Reply on RC1', Xiaoli Larsén, 22 Mar 2021
RC2: 'Review of Larsén and Fischereit - gmd-2020-358', Anonymous Referee #2, 23 Feb 2021
- AC3: 'Reply on RC2', Xiaoli Larsén, 22 Mar 2021

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Xiaoli Larsén on behalf of the Authors (07 Apr 2021) Author's response Author's tracked changes Manuscript

ED: Referee Nomination & Report Request started (09 Apr 2021) by Simon Unterstrasser

RR by Anonymous Referee #2 (27 Apr 2021)

Suggestions for revision or reasons for rejection

Congrats, the manuscript improved significantly. I have the following minor comments left:

Line 8: This is done using WRF with the code bug fixed …
-> This sounds strange: Maybe: This is done using a bug-fixed WRF version that includes the correct TKE advection following Archer et al. (2020).

Line 58: Wagner et al. (2019) showed that LLJs are a common phenomenon in …
-> The sentence is confusing. I suggest the following (please check if this is in-line with the findings of Wagner et al.): Wagner et al. (2019) showed that LLJs are a common phenomenon in the Southern North Sea. By analyzing 1.5 years of lidar and passive microwave radiometer data, they found that LLJ occurred on 65% of the days at least for a short period.

Line 144: The studies…
-> Better: These studies…

Line 212-214: For some wind farms, e.g. Alpha Ventus …
-> I think it would be good to mention all turbine types, where the actual turbine data was not used but a similar model was used.

Line 440: It remains inconclusive… (2 times)
-> I understand these sentences but I think both sentences would benefit from some elaboration. Please briefly explain "why".

Line 443: Neither scheme can not capture…
-> I guess you mean “Neither scheme can capture…”

Line 307: This is also often called …
-> I suggest to “this is referred to global blockage effect” and a recently discussed topic. And please refer to one or 2 recent relevant studies, e.g. https://www.mdpi.com/1996-1073/11/6/1609 or https://wes.copernicus.org/articles/6/521/2021/

Line 355: These characteristics can also be seen in a bird view of the spatial…
-> I suggest to use “horizontal wind field at XXXm height” instead of bird view.

Table 2: To my knowledge, the official reference of Ostia is: https://www.sciencedirect.com/science/article/pii/S0034425711002197

Everywhere: Please use the abbreviation Sect. instead of Sec. in accordance with Journal guidelines

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ED: Publish subject to minor revisions (review by editor) (29 Apr 2021) by Simon Unterstrasser

AR by Xiaoli Larsén on behalf of the Authors (05 May 2021) Author's response Author's tracked changes Manuscript

ED: Publish as is (10 May 2021) by Simon Unterstrasser

AR by Xiaoli Larsén on behalf of the Authors (17 May 2021) Author's response Manuscript

Short summary

For the first time, turbulent kinetic energy (TKE) calculated from the explicit wake parameterization (EWP) in WRF is examined using high-frequency measurements over a wind farm and compared with that calculated using the Fitch et al. (2012) scheme. We examined the effect of farm-induced TKE advection in connection with the Fitch scheme. Through a case study with a low-level jet (LLJ), we analyzed the key features of LLJs and raised the issue of interaction between wind farms and LLJs.