Atmospheric Modeling (5 ECTS)
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1 Atmospheric Modeling (5 ECTS) Lectures: Mon , Physicum D105 Tue , Physicum D104 Exercises: Mon , Physicum D105
2 Atmospheric Modeling (5 ECTS) Teachers Michael Boy, Dynamicum 1D01b Sampo Smolander, Dynamicum 1D09a Kenty Ortega, Dynamicum 1D16b Risto Makkonen, Physicum B415 Course web page slides, links to Fortran-guides, timetable
3 Preceding studies: A basic knowledge in one programming language (Fortran, MATLAB, C+, ) is required. However, we will use the first two lectures and exercises to give a short and comprehensive introduction and training to Fortran. Each student should have access to one computer and we will help to install a Fortran compiler if not already available.
4 Course content Introduction to Fortran Introduction to boundary layer meteorology modeling Including chemistry in the model Implementing emissions Modeling aerosol dynamical processes Overview of atmospheric models and complex modeling techniques
5 Course structure Lectures Exercise Developing a chemical transport model including biogenic emissions, chemistry and aerosol dynamics Bring your exercise material to the exercise session on memory stick, paper, or your laptop Exam Based on lecture content Your model must be ready before the exam
6 Mon Timetable for first week introduction to course starting Fortran introduction 1st exercise given (small Fortran task) Mon Checking that everyone has an environment for editing, compiling and running Fortran Tue Fortran introduction continues Checking 1st exercise Example of solving an equation in Fortran
7 Atmospheric modeling
8 Atmospheric modeling
9 Atmospheric modeling
10 Atmospheric modeling Meteorology -transport, radiative fluxes,... Chemistry & aerosols -OH, O 3, photolysis,... -aerosol formation, condensation,... Emissions -anthropogenic (SO 2, black carbon,...) -natural (organic compounds, dust,...)
11 Atmospheric particle formation chemistry chemistry nucleation condensation Emissions
12 How to make the computer solve our equations?
13 Modern programming languages C, C++ Python Java Perl Actionscript Matlab OCaml
14 Why would we use a programming language from the 50's?
15 Fortran (FORmula TRANslation) Simple to learn, less mistakes by beginners Almost all current scientific computational code is written in Fortran Availability of well tested libraries, especially for mathematics More space for compiler optimization, fast code Portability of code
16 The classic Hello World! example. Fortran program hello print *,"Hello World!" end program hello Java public class HelloWorld { public static void main(string[] args) { System.out.println("Hello, world!"); } } C++ Python #include <iostream> print "Hello, World!" int main() { std::cout << "Hello World!" << return 0; } std::endl;
17 PROGRAM squarerootexample! Comments start with an exclamation point.! Some exponentiation and squareroot computations.! You will find data type declarations, couple arithmetic operations! and an interface that will ask values for these computations. IMPLICIT NONE!do not use implicit variable declarations REAL :: x, y! Command line interface. Ask a number and read it in WRITE (*,*) 'Give a value (number) for x:' READ (*,*) x y=x**2+1! exponentiation and addition arithmetic WRITE (*,*) 'given value for x:', x WRITE (*,*) 'computed value of x**2 + 1:', y! SQRT(y), Return the square root of the argument y WRITE (*,*) 'computed value of SQRT(x**2 + 1):', SQRT(y) END PROGRAM squarerootexample
18 Data types INTEGER An integer number REAL A real number COMPLEX A pair of real numbers used in complex arithmetic LOGICAL TRUE or FALSE CHARACTER A string consisting one or more characters
19 !Variables can be initialized at their declaration IMPLICIT NONE! After declaration and initialization the value of a variable can be! changed whenever needed INTEGER :: n0 INTEGER :: n1=0 REAL :: a, b REAL :: r1=0.0 COMPLEX :: c COMPLEX :: imag_unit=(0.1, 1.0) CHARACTER(LEN=80) :: place CHARACTER(LEN=80) :: name='james Bond' LOGICAL :: test0 =.TRUE. LOGICAL :: test1 =.FALSE.! How to define constants? After declaration it can not be changed REAL, PARAMETER :: pi=
20 Precision The precision of a variable may be declared using the KIND-statement 1) SELECTED_INT_KIND(r) 2) SELECTED_REAL_KIND(p) 3) SELECTED_REAL_KIND(p,r) Explanations: 1) integer, range between -10 r < n < 10 r 2) real, precision at least p decimals 3) real, range -10 r < x < 10 r and precision at least p decimals INTEGER, PARAMETER :: short=selected_int_kind(4) INTEGER, PARAMETER :: double=selected_real_kind(12,100) INTEGER (KIND=short) :: index REAL (KIND=double) :: x,y,z COMPLEX (KIND=double) :: c x=1.0_double; y=2.0_double * ACOS(x)
21 Operators Arithmetic operators REAL :: x,y INTEGER :: i = 10 x=2.0**(-i)!exponentiation and negation precedence: first x=x*real(i)!multiplication and type change precedence: second x=x/2.0!division precedence: second i=i+1!addition precedence: third i=i-1!subtraction precedence: third Relational operators.lt. or <.LE. or <=.EQ. or ==.NE. or /=.GT. or >.GE. or >=!less than!less than or equal to!equal to!not equal to!greater than!greater than or equal to Logical operators.not.!logical negation precedence: first.and.!logical conjunction precedence: second.or.!logical inclusive disjunction precedence: third.eqv.!logical equivalence precedence: fourth.neqv.!logical nonequivalence precedence: fourth
22 Logical operators LOGICAL :: L1, L2! How to determine the values of logical expressions! F means.false. T means.true. L1 L2.AND..OR..EQV..NEQV. F F F F T F F T F T F T T F F T F T T T T T T F
23 Control structures 1) IF THEN ELSE (branching) 2) SELECT CASE (selecting) 3) DO (looping) PROGRAM test_if IMPLICIT NONE REAL :: x,y,eps,t WRITE(*,*)' Give x and y :' READ(*,*)x, y eps = EPSILON(x) IF (ABS(x) > eps) THEN t=y/x ELSE WRITE(*,*)'division by zero' t=0.0 END IF WRITE(*,*)' y/x = ',t END PROGRAM
24 Control structures: IF, ELSE, ELSE IF PROGRAM test_if IMPLICIT NONE REAL :: x,y,eps,t WRITE(*,*)' Give x and y :' READ(*,*)x, y eps = EPSILON(x) IF (ABS(x) > eps) THEN IF (y > eps) THEN t=y/x ELSE IF (ABS(y) < eps) THEN t = 0.0 ELSE t = 1.0 END IF END IF END PROGRAM
25 Control structures: SELECT CASE -SELECT CASE statements matches the entries of a list against the case index. Only one found match is allowed. -Usually arguments are character strings or integers. -DEFAULT-branch if no match found. -If there is no CASE DEFAULT and no match found then the statement following END SELECT is executed... INTEGER :: i LOGICAL :: isprimenumber... SELECT CASE (i) CASE (2,3,5,7)! variables are not allowed on the list isprimenumber =.TRUE. CASE (1,4,6,8:10)! case value range, form low:high isprimenumber =.FALSE. CASE DEFAULT! DEFAULT-branch isprimenumber = testprinumber(i)! function call END SELECT...
26 Control structures: DO, DO WHILE 1) DO-loop with an integer counter (count controlled) INTEGER :: i, stepsize, NumberOfPoints INTEGER, PARAMETER :: max_points= REAL :: x_coodinate(max_points), x, totalsum... stepsize=2 DO i = 1, NumberOfPoints, stepsize x_coordinate(i) = i*stepsize*0.05 END DO 2) DO WHILE-construct (condition controlled loop) totalsum = 0.0 READ(*,*) x DO WHILE (x > 0) totalsum = totalsum + x; READ(*,*) x END DO
27 Control structures: DO, DO WHILE 3) DO-loop without loop control REAL :: x, totalsum, eps totalsum = 0.0 DO READ(*,*) x IF (x < 0) THEN EXIT! inside loop control, exit the loop END IF totalsum = totalsum + x END DO 4) DO-loop, repeat until style eps = *EPSILON(1.0) DO...!Iterative loop body where ABS(x) is getting smaller and smaller IF (ABS(x) < eps) THEN EXIT END IF END DO! inside loop control, exit the loop
28 Control structures: example PROGRAM gcd! Computes the greatest common divisor, EUCLIDEAN ALGORITHM IMPLICIT NONE INTEGER, PARAMETER :: long = SELECTED_INT_KIND(9) INTEGER (KIND=long) :: m, n, t WRITE(*,*)' Give positive integers m and n :' READ(*,*) m, n WRITE(*,*)'m:', m,' n:', n positivecheck: IF (m > 0.AND. n > 0) THEN main_algorithm: DO WHILE (n /= 0) t = MOD(m,n) m = n n = t END DO main_algorithm WRITE(*,*)'Greatest common divisor: ',m ELSE WRITE(*,*)'Negative value entered' END IF positivecheck END PROGRAM gcd
29 Exercise #1 Create a Fortran program that reads a real number from a file calls a subroutine, which multiplies the value with pi (subroutine should be in a separate module-file) prints the multiplied value to screen The whole program is about lines
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