• Fitch, A. C., , J. B. Olson, , J. K. Lundquist, , J. Dudhia, , A. K. Gupta, , J. Michalakes, , and I. Barstad, 2012: Local and mesoscale impacts of wind farms as parameterized in a mesoscale NWP model. Mon. Wea. Rev., 140, 30173038.

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  • 1 * National Center for Atmospheric Research, Boulder, Colorado
  • | 2 NOAA/Earth System Research Laboratory, and Cooperative Institute for Research in Environmental Sciences, Boulder, Colorado
  • | 3 Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, and National Renewable Energy Laboratory, Golden, Colorado
  • | 4 Mesoscale and Microscale Meteorology Division, National Center for Atmospheric Research, Boulder, Colorado
  • | 5 Uni Research, Bergen, Norway
  • | 6 ** National Renewable Energy Laboratory, Golden, Colorado
  • | 7 College of Earth, Ocean, and Environment, University of Delaware, Newark, Delaware
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Corresponding author address: Anna C. Fitch, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000. E-mail: fitch@ucar.edu

Corresponding author address: Anna C. Fitch, National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000. E-mail: fitch@ucar.edu

In Fitch et al. (2012), it should be clarified that Eq. (12) defines the rate of change of turbulent kinetic energy (TKE) caused by the wind turbines, per unit mass of air, following convention. The units are m2 s−3. Similarly, Eq. (11) defines the power output of the wind turbines per unit mass. When calculating the power output with the conventional units of kg m2 s−3 (or W), Eq. (11) should be multiplied by the mass, resulting in the following:
e1
where Pijk is the power output (W) in grid cell i, j, k; ρijk is the air density; and Δx, Δy is the horizontal grid size in the zonal and meridional directions, respectively. The power coefficient of the turbines CP is a function of the horizontal wind speed |V|ijk, and Nt is the number of turbines per square meter.

This equation was used when calculating the power output shown in Fig. 12 in Fitch et al. (2012). The code distributed with the Weather Research and Forecasting Model (WRF) (versions 3.3 and onward) is unaffected.

REFERENCE

Fitch, A. C., , J. B. Olson, , J. K. Lundquist, , J. Dudhia, , A. K. Gupta, , J. Michalakes, , and I. Barstad, 2012: Local and mesoscale impacts of wind farms as parameterized in a mesoscale NWP model. Mon. Wea. Rev., 140, 30173038.

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