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대기물리1 7조

김준희 신지섭 정만수

Profiling Atmospheric Temperature of Venus Using Weighting Function

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    • Introduction
    • Method
    • Result
    • Discussion
    • References

목차

Contents

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1. Introduction

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1.1. Why

본 프로젝트에서는 weighting function을 이용한 대기 온도 프로파일을 실제 인공위성 radiance 데이터 자료로부터 산출해보고자 하였다. 태양계 행성의 대기에 대한 연구는 우주 탐사 프로그램에 진전을 이끌 수 있으며, 이론의 일반화에는 지구와 다른 대기 조성을 가지는 행성에 대한 적용이 유의미하다고 판단하였다. 이의 첫 단계로 금성을 꼽았다.

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Source : https://nssdc.gsfc.nasa.gov/planetary/factsheet/venusfact.html

    • Surface Temperature : 737K
    • Scale Height(H) : 15.9km
    • Atmospheric Depth : 250km
    • Surface Density : 68.22kg/m
    • CO2 Composition : 100%
    • Surface Pressure : 95,000 hPa

96.5%

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1.2. Venus

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Source : Ogohara, Kazunori, et al. "Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction." Earth, Planets and Space, vol. 69, no. 1, 12 Dec. 2017.

1.3. Akatsuki Satellite

    • The Japan Aerospace Exploration Agency’s (JAXA) first successful mission to other planet

: 'The Venus Climate Orbiter'

    • Mission : To understand the dynamics of atmosphere
    • Launch Date : 2010.05.18 ( Still in orbit)
    • Instruments : UVI, IR1, IR2, LIR, LAC

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Source : Ogohara, Kazunori, et al. "Overview of Akatsuki data products: definition of data levels, method and accuracy of geometric correction." Earth, Planets and Space, vol. 69, no. 1, 12 Dec. 2017.

    • Band Information

1.3. Akatsuki Satellite

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2. Method

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(Assuming non-scattering, non-reflecting plane-parallel atmosphere)

Satellite-Measured Radiances

Transmittance

W(s)

    • Radiative Transfer Equation
    • Terms we need to get :

2.1. Related Equations

 

 

 

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2.2. Radiances

    • Dataset : Akatsuki UVI (Ultraviolet Imager), IR1 (Infrared 1- μm Camera), IR2 (Infrared 2- μm Camera), and LIR

(Longwave Infrared Camera) Level-3 Dataset

    • Used Variables : Radiance [W/m /sr/m], Brightness Temperature [K], and Incidence Angle [degree]
    • Date : 2016-05-07 03~06 UTC
    • Calculated (Radiance/μ) for each pixel and then took a mean of all 1440*2880 pixels

​

2

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Source : https://hitran.org/

2.3. Absorption Coefficient of Carbon Dioxide

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k=0.00003

2.4. Weighting Functions for Different k value

k=0.16

k=5.10

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2.5. How to Induce Temperature

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3. Results

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Our Result

Source : Blumenthal, Kay, Palen, Smith (2012). Understanding Our Universe. New York: W.W. Norton & Company. p. 167.

Actual Profile

Temperature Profile of Venus Atmosphere

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4. Discussion

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Temperature Profile of Venus Atmosphere

Source : Blumenthal, Kay, Palen, Smith (2012). Understanding Our Universe. New York: W.W. Norton & Company. p. 167.

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5. References