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PODEn4DVar-based radar data assimilation scheme: formulation and preliminary results from real-data experiments with advanced research WRF (ARW) Cover

PODEn4DVar-based radar data assimilation scheme: formulation and preliminary results from real-data experiments with advanced research WRF (ARW)

Open Access
|Dec 2015

Figures & Tables

Fig. 1

The first guess field at 0010 UTC 08 July 2010. (a) Horizontal wind and vertical velocity (units: m/s) and (b) rainwater-mixing ratio (units: g/kg). The location of the single observation is marked by the red star.

Fig. 2

The increments at 0100 UTC 08 July 2010 on the eleventh model level from experiment SOE1. (a) Wind vector and vertical velocity (shaded, units: m/s) and (b) rainwater-mixing ratio (units: g/kg). The location of the single observation is marked by the black star.

Fig. 4

The south–north vertical section of increment of rainwater-mixing ratio (colour; g/kg) and vertical velocity (contour; m/s) from (a) SOE1 and (b) SOE2. The vertical sections are along 30.60°N.

Fig. 3

As in Fig. 2, but for the increments from the experiment SOE2.

Fig. 5

The vertical profiles of RMSEs in (a) u winds (m/s), (b) v winds (m/s), (c) w winds (m/s) and (d) rainwater-mixing ratio (g/kg) from the CTRL, LRASAss, and PRASAss results. The results of CTRL, LRASAss and PRASAss analysis field are denoted by blue squares, red triangles and green circles, respectively.

Fig. 6

The vertical profiles of RMSEs in (a) u winds (m/s), (b) v winds (m/s), (c) w winds (m/s) and (d) rainwater-mixing ratio (g/kg) from the CTRL, Cycle-1, Cycle-2 and Cycle-3 results. The results of CTRL, Cycle-1, Cycle-2 and Cycle-3 analysis field are denoted by black plus, red triangles, green circles, and blue squares, respectively.

Fig. 8

The 24-hour accumulated precipitation for (a) the observed (b) Exp-Sim and (c) PRASAss from 0000 UTC 08 to 0000 UTC 09 July 2010 (units: mm); the red star represents the location of the Doppler radar in Wuhan.

Fig. 7

The increments for vertical velocity and rainwater-mixing ratio on the eleventh model level: (a, b and c) vertical velocity (m/s) for the sizes 100, 120 and 142, respectively; (d, e, and f) rainwater-mixing ratio (g/kg) for the sizes 100, 120 and 142, respectively. The red star represents the location of the Doppler radar in Wuhan.

Fig. 9

The SAL verification of 24-hour forecast precipitation for Exp-Sim and PRASAss.

Fig. 10

The increments for wind field and rainwater-mixing ratio on the eighth model level. (a) Horizontal wind (vector, units: m/s) and vertical velocity (shaded, units: m/s); (b) rainwater-mixing ratio (units: g/kg). The black star represents the location of the Doppler radar in Wuhan.

Fig. 11

The south–north vertical section of increment along 116.2°E. (a) V wind (m/s). (b) rainwater-mixing ratio (colour; g/kg) and vertical velocity (contour; m/s).

Fig. 12

The difference between assimilated observed reflectivity and corresponding background reflectivity. All fields are computed at 2.4° scan surface.

Language: English
Page range: 26045 - 26045
Submitted on: Sep 17, 2014
Accepted on: Jan 21, 2015
Published on: Dec 1, 2015
Published by: Stockholm University Press
In partnership with: Paradigm Publishing Services

© 2015 Bin Zhang, Xiangjun Tian, Jianhua Sun, Feng Chen, Yuanchun Zhang, Lifeng Zhang, Shenming Fu, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.