STOCKHOLM—Volvo Car Group has appointed Jim Rowan as new chief executive to succeed long-time CEO Hakan Samuelsson in March, it said on Tuesday. Rowan, currently CEO at U.S-based Ember Technologies, is taking over just months after Volvo wrapped up its initial public offering, the biggest in Europe last year. He will face the task of steering the carmaker towards its goal to sell 50 percent pure electric cars by the middle of this decade and electric cars only by 2030. “Volvo Cars is going through a rapid transformation of digitalization which is why we wanted to bring in someone with global CEO experience from outside the automotive industry,” Volvo Chairperson Eric Li said in a statement. Samuelsson joined Volvo’s board in 2010 and has been CEO at the firm for almost 10 years, with his contract coming to an end this year. Volvo, majority owned by China’s Geely Holding, said …