June 21 1999 DC-8 Validation Experiment

On June 21st 1999 a MASTER validation experiment was conducted at Lake Tahoe, CA and Ivanpah Playa, CA by teams from the Jet Propulsion Laboratory (JPL) and the University of Arizona (UofA) respectively. The experiment involved overflights of the MASTER instrument at each of the 2 sites at 3 elevations. At Invanpah the 3 above sea level elevations were 3457m, 5530m, 7624m respectively. At L. Tahoe the 3 above sea level elevations were 4065m, 6067m and 8417m respectively. The MASTER instrument was flown on the NASA DC-8 Aircraft with custom air-fence. The radiance at the sensor was predicted by propagating ground measurements through the atmosphere and the predicted radiance compared to the MASTER measured radiance. The results for each of the MASTER channels at the 3 flight altitudes are summarized below.

Channel Number Center
Wavelength

Radiances (W/m2 um sr)

Low Altitude

Medium Altitude

High Altitude

Predict MASTER %

Difference

Predict MASTER % Difference Predict MASTER %

Difference

1

0.459

124.358

122.566

1.441

131.015

127.962

2.330

135.797

134.401

1.028

2

0.5

142.783

144.083

-0.910

147.403

147.546

-0.097

150.498

153.022

-1.677

3

0.542

174.733

175.376

-0.368

177.920

177.194

0.408

179.690

181.893

-1.226

4

0.582

204.982

203.661

0.644

207.005

204.002

1.451

207.870

208.359

-0.235

5

0.663

204.071

210.522

-3.161

205.027

210.005

-2.428

205.342

213.873

-4.155

6

0.713

183.137

193.580

-5.702

182.533

191.957

-5.163

182.758

195.370

-6.901

7

0.753

169.266

180.505

-6.640

168.567

178.931

-6.149

168.299

181.433

-7.804

8

0.802

163.047

175.039

-7.355

162.920

173.230

-6.328

163.173

175.747

-7.706

9

0.868

142.625

156.359

-9.629

143.063

155.366

-8.600

143.293

157.265

-9.751

10

0.907

106.679

122.458

-14.792

105.057

119.652

-13.892

105.238

121.141

-15.112

11

0.949

61.200

85.708

-40.047

58.344

81.535

-39.749

58.529

82.100

-40.272

12

1.609

42.914

45.182

-5.285

42.908

45.601

-6.276

42.843

46.056

-7.500

13

1.664

39.173

41.896

-6.952

39.186

42.315

-7.985

39.176

42.727

-9.065

14

1.72

32.467

35.605

-9.663

32.289

35.839

-10.996

32.317

36.204

-12.027

15

1.774

17.275

21.224

-22.860

16.717

20.917

-25.122

16.782

21.168

-26.139

16

1.828

0.930

0.379

59.194

0.827

0.355

57.130

0.838

0.354

57.720

17

1.876

0.074

1.726

-2231.770

0.071

1.577

-2133.612

0.071

1.521

-2051.216

18

1.926

0.567

3.169

-458.804

0.476

2.876

-504.441

0.467

2.862

-512.532

19

1.98

7.445

9.797

-31.591

6.867

9.403

-36.930

6.746

9.357

-38.693

20

2.08

14.831

16.071

-8.361

14.452

15.968

-10.488

14.257

15.898

-11.513

21

2.16

14.546

15.650

-7.594

14.516

15.733

-8.384

14.520

15.800

-8.812

22

2.21

12.188

13.786

-13.112

12.151

13.812

-13.666

12.138

13.841

-14.031

23

2.258

11.282

12.467

-10.505

11.232

12.455

-10.888

11.174

12.434

-11.280

24

2.328

8.494

8.987

-5.810

8.348

8.903

-6.657

8.278

8.883

-7.308

25

2.393

5.178

5.457

-5.400

4.967

5.334

-7.390

4.948

5.365

-8.413

% Difference = (P-M/P)*100

 

Channel Number Center
Wavelength

Radiances (W/m2 um sr)

Low Altitude

Medium Altitude

High Altitude

Predict MASTER %

Difference

Predict MASTER % Difference Predict MASTER %

Difference

41

7.746

6.041

5.766

4.552

5.340

5.254

1.607

4.755

4.650

2.213

42

8.163

6.916

6.813

1.490

6.666

6.618

0.722

6.492

6.428

0.990

43

8.607

7.422

7.386

0.487

7.328

7.301

0.378

7.287

7.261

0.363

44

9.045

7.717

7.686

0.401

7.655

7.629

0.342

7.638

7.604

0.441

45

9.671

7.952

7.920

0.406

7.863

7.716

1.872

7.746

7.642

1.337

46

10.086

7.997

7.972

0.313

7.958

7.909

0.620

7.942

7.894

0.604

46

10.618

7.948

7.927

0.261

7.910

7.889

0.265

7.907

7.876

0.386

48

11.313

7.748

7.718

0.378

7.710

7.683

0.358

7.711

7.674

0.487

49

12.111

7.367

7.298

0.931

7.317

7.241

1.036

7.310

7.243

0.908

50

12.869

6.907

6.813

1.351

6.803

6.746

0.832

6.747

6.714

0.490

% Difference = (P-M/P)*100

 

Channel Number Center
Wavelength

Brightness Temperatures

Low Altitude

Medium Altitude

High Altitude

Predict MASTER BT

Difference

Predict MASTER BT Difference Predict MASTER BT

Difference

41

7.746

9.898

7.904

1.994

4.682

4.011

0.671

-0.050

-0.946

0.896

42

8.163

12.722

12.027

0.694

11.027

10.696

0.331

9.826

9.375

0.451

43

8.607

13.528

13.287

0.241

12.908

12.723

0.185

12.635

12.457

0.178

44

9.045

13.726

13.518

0.208

13.314

13.138

0.176

13.196

12.969

0.227

45

9.671

13.948

13.723

0.225

13.328

12.294

1.033

12.509

11.776

0.733

46

10.086

14.015

13.835

0.181

13.734

13.378

0.356

13.617

13.271

0.347

46

10.618

14.010

13.852

0.158

13.725

13.565

0.160

13.701

13.468

0.233

48

11.313

13.920

13.677

0.243

13.610

13.381

0.229

13.618

13.305

0.312

49

12.111

13.541

12.905

0.636

13.080

12.375

0.705

13.010

12.391

0.619

50

12.869

12.851

11.878

0.973

11.771

11.177

0.594

11.182

10.834

0.348

BT Difference = (P-M)