I d i R h E iIntroduction to Research Experience

Diao Yiwei

Research 1: Soil CO2 Concentration under FACE Condition in Wuxi

• 刁一伟, 郑循华, 王跃思, 徐仲均, 宋涛, 郎红东, 朱建国. 2004. 土壤温度和湿度对冬小麦田土壤空气CO2浓

度的影响, 气候与环境研究, vol.9 (4): 584-590.

• 刁一伟, 郑循华, 王跃思, 徐仲均, 韩圣慧, 朱建国. 2002. 开放式空气CO2浓度增高条件下旱地土壤气体CO2

浓度廓线测定, 应用生态学报, 13(10): 1249-1252.浓度廓线测定, 应用生态学报, 13(10): 1249 1252.

Research 2: Scalar Exchange Within and Above F t CForest Canopy

• Site: Changbai Mt.g• Instrument: Open-Path Eddy Covariance• Theory: Lagrangian Dispersion Model, Eulerian Model, Mellor model• Computing Platform: Linux, Matlab, Fortran.

Turbulence Characteristics in the Forest Volume刁一伟, 王安志, 关德新, 金昌杰, 裴铁璠. 中性大气稳定度条件下林冠湍流特征模拟, 应用生态学报, 2010.

2.5 2.5

z/h

1.5

2.0 实测值

模拟值 LAI

z/h

1.5

2.0-uw/u*

2

LAI

无量纲高度

z

1.0

1.5

无量纲高

度

1.0

.5

无

0 2 4 6 80

0.5

u/u0 1 2 3 4 5

0

0.5

2/u/u* 2*/uw u

Vertical profile of normalized Reynolds stress, the leaf area index profile LAI is also shown.

Vertical profile of normalized horizontally averaged longitudinal velocity, the leaf area index profile LAI is also shown.

Turbulence Characteristics of Forest Volume (con't)

1 5

2.0

uu/u*2

vv/u*2

2.0

Pd Ps

Pt

量纲高度

z/h

1.0

1.5 *

ww/u*2

LAI

量纲高度

z/h

1.0

1.5

t Pw

无量

0.5

无量

0

0.5

0 1 2 3 4 50

2*/i iu u u

-20 -15 -10 -5 0 5 10 15 20 0

2

3*

/ 2h qu t

Vertical profile of normalized velocity variance, the leaf area index profile LAI is also shown.

Vertical profile of normalized TKE budget

1 5

2

1 5

2

1 5

2(a) (b) (c)

0.5

1

1.5

0.5

1

1.5

0.5

1

1.5

z/h

2

0 5 100

u/u*

-1 -0.5 00

<uw>/u*2

2 2

0 2 4 60

A(z)h

(d) ( ) (f)

0 5

1

1.5

z/h

0 5

1

1.5

0 5

1

1.5(d) (e) (f)

0 1 20

0.5

<ww>/u*2

0 2 40

0.5

<uu>/u*2

-0.5 0 0.50

0.5

SKw/u*3

• Modeled mean longitudinal velocity, momentum flux, longitudinal variance , vertical variance, and third-moment(or SKw). The normalizing length and velocity scales are the friction velocity (u*) and canopy height (h). The normalized leaf area density profile is also shown.

Heat Source/Sink Within/Above Forest Canopy刁一伟, 王安志, 关德新, 金昌杰, 裴铁璠. 大气热层结条件对林冠显热的影响, 应用生态学报, 2010, vol21, 1.

2.07:00

14:00

1.0

1.55:30

22:00

20:00

10:00

无量纲高

度 z

/h

0.5

16:00

12:00

无

• Representative profiles of air temperature above and within the forest canopy, 4 May 2003.

14 16 18 20 22 24 260

温度 Temperature (℃)

p p p py, y

1.20.6

Time-depth evolutions of sensible heat source/sink strength in 1 May 2003.

1.2 300

400

Time-depth evolution of sensible heat flux in 18 June 2003.z/

h

0 6

0.8

1.0

0

0.2

0.4

z/h

0 6

0.8

1.0

-100

0

100

200

0.2

0.4

0.6

-0.4

-0.2

0

0.2

0.4

0.6

-400

-300

-200

100

Time (hr)0 2 4 6 8 10 12 14 16 18 20 22 24

Time (hr)0 2 4 6 8 10 12 14 16 18 20 22 24

400Linear model f(x) = 0.8394*x + 11.53Goodness of fit:

200

300

UL

(W m

-2)

Goodness of fit: R-square: 0.9035 RMSE: 34.57

100 200 300 400

(W m

-2)

100

0

100H-E

U

0 1 2 3 4 5 6 7 8 9 10-200-100

0

Day

H

-100 0 100 200 300 400-100

H-EC (W m-2)

400

Unstable

400

Neutral

400

Stablem-2

)

400

500

0 200 400

0

200

20 200 400

0

200

20 200 400

0

200

2

H-E

UL

(W

0

100

200

300

通量

H (W

m-2

)

H-m (W m-2)H-m (W m-2)H-m (W m-2)

1.2

Stable Neutral Unstable

(a) (b) (c) -200

-100

0

0 4 8 12 16 20 24 28 32 36 40 44 48

显热通

0.8

1.0

ProductionTransport

时间 Time (hh)

The counter-gradient fluxes within the canopy was discovered by modeling the heat flux under

0.4

0.6

TransportBuoyancyDisspation

was discovered by modeling the heat flux under stabile atmospheric condition. By accounting for atmospheric stability, the ability to infer the heat flux distribution within and above the canopy for stable unstable and near neutral conditions

-0.05 0 0.050

0.2

-0.05 0 0.05 -0.05 0 0.05

stable, unstable, and near-neutral conditions improved. The proposed method is sufficiently robust for use in long-term flux monitoring initiatives.

TuhzTw c /)/(

Water Vapor Source/Sink Within/Above Forest Canopy

z/h c

z/h c

Wang, A., C. Jin, Y. Diao, D. Guan, and T. Pei (2005), Estimation of water vapor source/sink distribution and evapotranspiration over broadleaved Koreanpine forest in Changbai Mountain using inverse Lagrangian dispersion analysis, Journal of Geophysical. Research, 110, D08102, doi:10 1029/2004JD005227

(a) Time

(b)Time

doi:10.1029/2004JD005227.

1. Time-depth evolution of average H2O source/sink strength in May (a), June (b), July (c), August (d) and September (f)

z/h c

z/h c

and September (f). 2. Time-depth evolution of the daily average H2O

source/sink strength (g m-3 s-1).

(c) Time

(d)Time

z/h

z/h c

无量

纲高

度

(e) Time 儒略日 Julian day (d)

CO2 Source/Sink Within/Above Forest CanopyDiao, Y., A. Wang, D. Guan, C. Jin, and T. Pei (2006), Modeling CO2 source-sink and flux over broadleaved Koreanpine forest in Changbai Mountain using inverse Lagrangian dispersion analysis Journal of Geophysical Research 111 D15S90Changbai Mountain using inverse Lagrangian dispersion analysis, Journal of Geophysical. Research, 111, D15S90, doi:10.1029/2005JD006493.

1

CO

2 flu

x (m

g kg

-1 m

s-1)

0 5

0

0.5

y = 1.0682x + 0.0872R2 = 0.89

模拟

值 M

odel

ed

-1.5 -1 -0.5 0 0.5 1-1.5

-1

-0.5

1 1实测值 Measured CO2 flux (mg kg-1 m s-1)

Research 3: Others

1. Anzhi Wang, Yiwei Diao, Tiefan Pei1, Changjie Jin. 2006. A semi-theoretical model of canopy rainfall interception for a broad leaved tree. Hydrological Processes. 21, 0–0 (2007) DOI: 10.1002/hyp.6413. ：Through a series of simulation experiments in the laboratory on the broad-leaved tree Acer mono Maxim, we obtain interception datasets of individual events under different rainfall intensities and leaf area indexes (LAIs).

2. Li, G., Y. Wang, K.-H. Lee, Y. Diao, and R. Zhang (2008), The Effects of Aerosols on Development and Precipitation of a Mesoscale Squall Line, Journal of Geophysical. Research, Vol. 114, D17205, doi:10.1029/2008JD011581, 2009. ：The effects of aerosols on the development and precipitation for a mesoscale squall line occurring in the south plains of the United States have been investigated using a cloud-resolving Weather Research and Forecasting (CR-WRF) model with a two-moment bulk microphysical scheme. The influence of aerosol concentrations is insignificant on the rainfallwith a two moment bulk microphysical scheme. The influence of aerosol concentrations is insignificant on the rainfall distribution but is remarkable on the precipitation intensity.

3. 刘建梅, 王安志, 裴铁璠, 刁一伟. 2005. 杂谷脑河径流趋势及周期变化特征的小波分析. 北京林业大学学报, 27(4): 49-55.

4 Li G Y W K H L Y Di d R Zh (2008) I d i t i it ti th N th P ifi f4. Li, G., Y. Wang, K.-H. Lee, Y. Diao, and R. Zhang (2008), Increased winter precipitation over the North Pacific from 1984–1994 to 1995–2005 inferred from the Global Precipitation Climatology Project, Geophys. Res. Lett., 35, L13821, doi:10.1029/2008GL034668.

5. 刘建梅, 王安志, 刁一伟, 裴铁璠. 分布式模型在流域蒸散模拟中的应用与验证. 应用生态学报, 2005, 16(12).

6. 刁一伟, 裴铁璠. 2004. 森林流域生态水文过程动力学机制与模拟研究进展, 应用生态学报, 15(12): 2369-2376.

Th k ！Thanks！